Abbreviations
  A
  AFAIK: As Far As I Know.
  AFOL: Adult Fan Of LEGO®.
  AJ: Amazon Jungle - Adventurers Subtheme.
  ASAP: As Soon As Possible.
  ATSF: Atchison, Topeka and Santa Fe - Santa Fe corporate name.

  B
  BF: Black Falcons - Castle Subtheme; Boyfriend; BrickFest™.
  BFF: Black Falcon's Fortress - Lego® Castle set 6074 and 10039.
  BI: Building Instructions.
  BK: Black Knights - Castle Subtheme.
  BL: BrickLink - Unofficial Online LEGO® Marketplace.
  BOGO: Buy One Get One - (for free).
  BSB: Black Seas Barracuda - Lego® Pirates Set 6285 and 10040.
  BT: Blacktron - Space Subtheme.
  BTB: Bob the Builder - DUPLO® Subtheme.
  BTW: By The Way.
  BURP: Big Ugly Rock Piece - Mountain Piece.
  BURPMAN: Big Ugly Rock Person Made Annoyingly Nonmobile = The
    monster from the Rock Raiders Theme.
  BV: Belville - Lego® Theme.
  BW: BrickWars - Wargames using Lego® pieces.
  BYFMTWW: Bring Your Favourite Minifig To Work Week.

  C
  AFAIK: As Far As I Know.
  CAD: Computer Aided Design.
  CLSOTW: Cool LEGO® site of the Week.
  CMIIW: Correct Me If I'm Wrong.
  CP: Cross Posted - To another Forum/Newsgroup.
  CRAPP: Crummy Ramp and Pit Plate - Baseplate with ramp and pit.
  CW: Castle World - Fan-created world related to the castle theme.

  D
  DDK: Droid Developer Kit - Lego® Mindstorms Set 9748.
  DFD: Deep Freeze Defender - Lego® Space Set 6973.
  DI: Dino Island - Adventurers Subtheme.
  DK: Denmark; Danish.
  DKK: Danske Kroner - Danish Currency.
  DM: Dragon Masters - Castle Subtheme.
  DSDK: Dark Side Developer Kit - Lego® Mindstorms Set 9754.

  E
  ED: Egyptian Desert - Adventurers Subtheme.
  ELSA: LSAH - LEGO® Shop at Home - LEGO® Company's own shop.

  F
  FA: For Auction.
  FAQ: Frequently Asked Questions.
  FL: Fabuland - Lego® Theme.
  FOTD/W/M/C: Find of the Day/Week/Month/Century - Very good deal.
  FS: For Sale.
  FSOT: For Sale Or Trade.
  FT: For Trade.
  FTR: For the Record.
  FUT: Follow-Up To.
  FWIW: For What it's Worth.
  FYI: For Your Information.

  G
  GI: Guarded Inn - Lego® Castle Set 6067 and 10000.

  H
  HAND: Have A Nice Day.
  HOG: Hand of God - When you move your minifigs around.
  HP: Harry Potter - Lego® Theme.
  HTH: Hope That Helps.

  I
  IANAL: I Am Not a Lawyer.
  IE: Internet Explorer - Internet browser.
  IG: Imperial Guards - Castle Subtheme.
  IIDSSM: If I Do Say So Myself.
  IIRC: If I Recall Correctly.
  IMHO: In My Humble Opinion.
  IMNSHO: In My Not So Humble Opinion.
  IMO: In My Opinion.
  IOW: In Other Words.
  ISD: Imperial Star Destroyer - Lego® Star Wars™ Set 10030.

  J

  K
  KABOB: Kid With a Bunch of Bricks.
  KFOL: Kid Fan of LEGO®.
  KISS: Keep It Simple, Stupid; Keep It Short and Simple.
  KK: Knights Kingdom - Castle Subtheme.

  L
  LD: LEGO® Direct.
  LIC: LEGO® Imagination Center.
  LL: LEGOLAND® - Official LEGO® Theme Park.
  LMK: Let Me Know.
  LMKWYT: Let Me Know What You Think.
  LOL: Laughing Out Loud.
  LOM: Life On Mars - Space Subtheme.
  LSAH: LEGO® Shop at Home - The LEGO® Company's own shop.
  LTC: LEGO® Train Club - Club of train fans.
  LUG: LEGO® User Group - Club of LEGO® fans.
  LUGNET™: LEGO® User Group Network - International LEGO® fans
    community.

  M
  MCM: Mega/Multi Core Magnetizer - Lego® Space Set 6989.
  MF: Minifig; Millennium Falcon - Lego® Star Wars™ Set 7190.
  MIB: Mint In Box.
  MISB: Mint In Sealed Box.
  MISP: Mint In Sealed Polybag.
  MOC: My Own Creation - Original creations not from the LEGO®
    Company.
  MOT: My Own Train - Series of LEGO® train sets.
  MOTD/W/M: Model of the Day/Week/Month.
  MSIE: Microsoft Internet Explorer - Internet browser.
  MT: Model Team - Lego® Theme; M-Tron - Space Subtheme.

  N
  NDL: Neptune Discovery Lab - Lego® Aquazone Set 6195.
  NLF: Non-Lego® Friend/Fiancé/Fiancée.
  NLP: Non-Lego® Parent.
  NLS: Non-Lego® Spouse.
  NLSO: Non-Lego® Significant Other.
  NN: Netscape Navigator - Internet browser.

  O
  OBO: Or Best Offer.
  OE: Orient Expedition - Adventurers Subtheme.
  OMFIAMP: One Man's Food is Another Man's Posion.
  OT: Off Topic.
  OTOH: On the Other Hand.

  P
  PEWC: Prefab Explorien Wing, Cockpit.
  POOP: Piece (that can or should be made) of Other Pieces.
  POV: Point of View.

  Q

  R
  RBR: Red Bear Runner - Lego® Pirates Set 6289 and 6290; Rebel
    Blockade Runner - Lego® Star Wars™ Set 10019.
  RIS: Robotics Invention System - Lego® Mindstorms Set 9719, 9747 or
    3804.
  RK: Royal Knights - Castle Subtheme.
  ROFL(OL): Rolling On the Floor Laughing (Out Loud).
  RPG: Role Playing Game.
  RR: Railroad; Rock Raiders - Lego® Theme.
  RSN: Really Soon Now.
  RTL: rec.toys.lego - A newsgroup about Lego®.

  S
  S@H: Shop at Home - The LEGO® Company's own shop.
  SES: Skull's Eye Schooner - Lego® Pirates Set 6286.
  SFSC: Santa Fe Super Chief - Lego® Train Set 10020.
  SKU: Stock Keeping Unit.
  SNOT: Studs Not On Top.
  SP: Space Police - Lego® Space Subtheme.
  STAMP: Sticker Across Multiple Pieces.
  SPUD: Special/Single Piece/Purpose Ugly/Useless/UnLEGOish
    Design/Decorative.
  SW: Star Wars™ - Lego® Theme.

  T
  TC: Time Cruisers - Lego® Town Subtheme.
  TIA: Thanks In Advance.
  TLC: The LEGO® Company.
  TLG: The LEGO® Group.
  TRU: Toys'R'Us.
  TT: Time Twisters - Lego® Town Subtheme.

  U
  UCS: Ultimate Collector's Series - Start Wars™ Subtheme.

  V

  W
  WP: Wolfpack - Lego® Castle Subtheme.
  WTB: Want To Buy.
  WTT: Want To Trade.
  WW: Wild West - Same as Lego® Western Theme.

  X
  XP: Cross Posted - To another Forum/Newsgroup.
  XFUT: X-posted to and followups set to - To another Forum/Newsgroup.

  Y
  YCLIU: You Could Look It Up.
  YMMV: Your Mileage May Vary.

  Z