I don't think we've ever put them all together, because there really are quite a few. Some are standard abbreviations, some are internet abbreviations, and some are specifically knife-oriented.
There are previous threads with a few answers to the same question, but nothing extensive or definitive. So. Let's do it here! I found a few old threads and sequenced the information, added a few of my own, and referenced three online dictionaries. Any others, please post, even if you don't know the meaning -- those are the ones newbies particularly need.
Knife Knut Abbreviations
AFAIK - As Far As I Know
AO - Assisted Opening
ASAP - As Soon As Possible
ASP - ASP company's expandable baton
BG - Bad guy (see Goblin)
BK1 - Benchmade's proprietary black blade coating
BTTT - Back To The Top (bringing a thread to the top of the forum list)
BTW - By The Way
CE - Combo/Combination Edge, part serrated (see PE, SE)
CCW - Concealed Carry Weapons permit
CF - Carbon Fiber
CQC - Close Quarter Combatives
CS - a tear gas (see OC)
DA - Dual Action (OTF automatic knife) opens & closes by same slide button
DA - Double Action (automatic knife) opens auto or manually
DLC - Diamond Like Coating (by Bodycoat)
EDC - Every Day Carry
etc. - et cetera (and the rest, similar things)
FB - Fixed Blade
FRN - Fiberglass Reinforced Nylon (like Zytel)
Goblin - bad guy or attacker in real life, not training (see BG)
HAK - HideAway Knife (by HAK company)
IIRC - If I Recall Correctly
IMO - In My Opinion
IMHO - In My Humble Opinion
IMNSHO - In My Not So Humble Opinion
IOW - In Other Words
IWB - Inside the WaistBand (see SOB)
JMO - Just My Opinion
LEO - Law Enforcement Officer
LOL - Laughing Out Loud
OAL: Overall Length
OC - Oleoresin Capsicum pepper spray (see CS)
OTF - Out The Front (automatic knife)
PE - Plain Edge, non-serrated (see CE, SE)
PSK - Personal Survival Knife or Personal Survival Kit
RC - Rockwell 'C' scale of metal hardness
ROFL - Rolling On the Floor laughing
ROTFLMAO - Rolling On The Floor Laughing My Ass Off
SAK - Swiss Army Knife
SD - Self Defense
SE - Serrated Edge (see CE, PE)
SOB - Small Of the Back (see IWB)
SS - Stainless Steel
SWAK - Swedish Army Knife (green Mora Clipper)
TEOTWAWKI - The End Of The World As We Know It
Ti - Titanium
TLA - Three Letter Abbreviation
TMI - Too Much Information
WSK - Wilderness Survival Knife
WTF - Wish To Fly (said by prospective Air Force enlistees)
YMMV: Your Mileage May Vary (You may have a different opinion or result)
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NetLingo
http://www.netlingo.com/
Urban Dictionary is a slang dictionary with your definitions
http://www.urbandictionary.com/
Dictionary.com (Dictionary Thesaurus Encyclopedia)
http://dictionary.reference.com/
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Knife Companies
AFKC = American Fighting Knife Company
ASP = Expandable steel non-flexible baton (Armament Systems and Procedures)
BM - Benchmade
CRK - Chris Reeve Knives
CS = Cold Steel
DDR - Darrel D. Ralph, knifemaker
EKI - Emerson Knives
ER - Extrema Ratio
SOG - SOG Knives from Special Operations Group (Vietnam)
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If you have a problem searching, see this
Sticky: Search Engine FAQs & Tips By Quiet Storm.
READ THIS FIRST! How to ask questions that get answered.
You will find instructions on posting pictures there.
A.G.Russell Knife Encyclopedia Articles
http://www.agrussell.com/knife_information/knife_encyclopedia/articles.html
including Blade Geometry FAQ
http://www.agrussell.com/knife_information/knife_encyclopedia/articles/blade_geometry_faq.html
A.G.Russell Knife Encyclopedia Glossary
http://www.agrussell.com/knife_information/knife_encyclopedia/glossary.html
EDC Knives - Knife Knowledge
http://www.edcknives.com/vcom/knife_knowledge.php
KnifeArt articles
http://www.knifeart.com/knifearticles.html
State Knife Laws by Bernard Levine
http://pweb.netcom.com/~brlevine/sta-law.htm#S-W
AKTI - American Knife & Tool Institute
http://www.akti.org/
Knife Rights
http://www.kniferights.org/
HRA - National Rifle Association
http://www.nra.org/
Wikipedia - Knife
http://en.wikipedia.org/wiki/Knives