Here you are, sorted and alphabetized. I wrote some more as I thought of them. I didn't go into the Stormtrooper or Vader helmet parts as someone suggested. We need more finishing techniques. I added a couple...
If you'd like to see me change or edit out anything, please let me know.
1:1 - Means a full scale or life-sized replica, as opposed to studio scale.
501st - Star Wars Imperial costuming group founded by Albin Johnson that costumes at conventions, officially sanctioned events, and for charity. Primarily composed of Stormtroopers, but made up of all designations of Imperial troops, sith, bounty hunters, Galactic Republic Clonetroopers, and non-affiliated aliens. Costume must be close to screen worthy, better than most licensed costumes. 501st has also come to refer to the blue accented clone troopers that slaughtered Jedi with Anakin or any stormtrooper that accompanies Darth Vader.
5E - Fifth Element - Science Fiction film from 1997.
$100 - The maximum amount you've spent on any single prop, as far as your spouse knows.
AA - 1) Andrew Ainsworth, manufacturer of Star Wars armor for A New Hope. Launched a business in 2005 to sell Star Wars armor. Has been involved in a rights dispute with Lucasfilm over his ability to manufacture costumes for sale. Hotly debated as to whether any of his claims are true. See SDS. 2) Art Asylum, a toy company that produces inexpensive toy replicas of the Star Trek phaser.
ABS - (Acrylonitrile butadiene styrene) Popular Thermoplastic vacuform medium that is glossy on one side. Usually stronger than styrene but might not have same sharpness of detail. May be used in conjunction with other terms such as ABS bucket, ABS lid, ABS sunblock.
ABS Sunblock - Term for a costume made from ABS, most likely refers to Stormtrooper armor.
active project - Something several people want to see replicated and are willing to work together to achieve.
AFBB - As First Built Buy - Refers to an idealized prop that looks like it is brand new.
AICN - Ain't it Cool News geek website and news portal for movies and television. Often a source for the latest news and rumors regarding genre films and television.
alginate - Seaweed based material used for making dental impressions. Useful for fast, crude, non-permanent mold making, often for life casting. Powder mixed with water.
ANH - A New Hope (Star Wars: Episode 4).
AOTC - Attack Of The Clones (Star Wars: Episode 2).
ASAP - A Site About Props (another prop forum).
B5 - Babylon 5 - Science Fiction series that ran from 1994-1998 about a space station governed by the Earth Alliance to provide peace and stability among alien cultures.
background prop - Rough prop that doesn't feature strongly in the story and may not be detailed much.
Barbican - The name given to the Vader lightsaber variant that was featured at the Barbican museum. Yet to be realized as a prop though it has proven popular as an active project in an attempt to realize it as a prop.
Bat'leth - Klingon sword designed by martial arts enthusiast and effects producer, Dan Curry, for Star Trek: The Next Generation.
BBC - Blaster Builders Club, forum for those who like to scratch build guns.
blaster - Generic term for a science fiction based gun.
blow foam- (also called Blo-foam) Slang term for expanding urethane foams commonly used for filling or casting. Can be two-part mix or "in a can" like commercial product, Great Stuff.
blue meanies - Soft, or uncured areas in silicone where the catylist wasn't mixed thoroughly.
bondo malt - Mixture of fiberglass resin and auto-body filler. Used for crude castings that will be modified.
bowcaster - Name for the wookie weapon based on a crossbow used in Star Wars episodes 4-6.
bowjunkie - Banned vendor. Fails to deliver.
box cutter - Usually a simplified version of a matte knife with retractable blade. May have a segmented blade that can be snapped off to "re-sharpen" the tip.
BR - Blade Runner
BSG - Battlestar Galactica. When used alone, it may refer to either series. May be used in conjunction with TOS, representing The Original Series.
BTTF - Back to the Future
buck- Thermo-form or vacuum-form mold (positive).
bucket - Helmet. Often used to refer to a stormtrooper helmet.
bucket mold - A one-piece silicone mold with a simple cavity for pouring resin in. Filled by pouring resin into an opening at the top.
bump - Means of calling attention to a thread that has fallen from the top of the page without actually adding anything relevant, just a new post that reads, "BUMP".
CA - Cyano-acrylite or super glue.
Canon - Regards what is seen on screen in the movies as opposed to other sources.
C&D - Cease and Desist, legal request to stop manufacturing immediately or face legal repercussions.
C&S - Coyle and Steinshneider. Richard Coyle is a props maker and manufacturer of various blasters and phasers. Phil Steinschneider is a broker of screen used and rare items and props researcher. See also, RC.
cavity - Proper term for the space in a mold you fill with resin.
CE3K - Close Encounters of the Third Kind
Chest box - Any of a number of life-support devices used in Star Wars. May specifically refer to Darth Vader's chest box.
Christies - A rarities auction house which often sells screen used collectibles.
cost-only project - Also called, At Cost Project. A project that only costs the amount of supplies and materials used to create it and does not factor in a profit margin or time spent.
COW - Club Obi-Wan (Indiana Jones themed forum).
D - Delorean, automobile used for the time machine in Back to the Future.
DDC - Designation for the sporting pistol that Leia Organa uses in Star Wars episodes 4 and 6.
dead prop - See static prop.
de-airing chamber - Device used to decrease the air pressure around a mixed batch of resin or silicone. Causes existing air bubbles to expand and pop, thus releasing trapped air from the mixture. Also called de-gasing
Delrin - Commercial name for machinable nylon prototyping material. Notable for it's low-friction surface qualities.
Derwent - Refers to an engine from a Rolls Royce jet which was salvaged for many parts in Star Wars episodes 4-6. The inter-connector was used for the emitter on Obiwan's lightsaber. Another part composed part of the cantina clutter and the bounty hunter IG-88's head.
Disruptor - Name for the beam energy weapon used by Klingons, Cardassians, Romulans, Breen, and Orion in the Star Trek series.
D'k tahg - Klingon dagger consisting of a main blade with cut-out center and two shorter, retractable spring blades to either side.
DL-44 - Designation for the Mauser Broomhandle pistol used by Han Solo and Luke Skywalker in Star Wars episodes 4-6.
Dry-brushing - Wiping almost all of the paint off of a brush then using the little that remains to fleck little bits of paint over another color.
DS9 - Star Trek: Deep Space Nine. Third Star Trek franchise that ran from 1993-1999. Set aboard a space station near a black hole conduit to another galaxy.
E-11 - Designation for the Stormtrooper rifle used in Star Wars episodes 4-6.
EDC/Charles Wallace - Banned vendor. Fails to deliver.
Enfield - Lee-Enfield No. 1 Mark 3 rifle served as the basis for the ion gun used by the jawas in Star Wars: Episode 4 to incapacitate R2-D2.
ENT - Star Trek: Enterprise
epoxy - Strong two part glue that is mixed in equal parts before use.
epoxy putty - Often used by plumbers to seal leaky pipes. A two-part putty mixture that hardens and sticks extremely well to most materials. Can be used as a filler or a sculpting compound. Can be purchased in large quantities under product name: Apoxie-Sculpt or in smaller amounts under generic name "plumber's putty" at your local hardware store.
ESB - Empire Strikes Back (Star Wars: Episode 5).
EU - Expanded Universe - Term for characters that appear outside of canon (films) such as cartoons, comic books, book covers, video games, etc...