Abbreviations/Acronyms used in eBay's message areas

ADDY = Address
AFAIK = As far as I know
AFK =  Away from Keyboard
AKA = Also known as
ASAP = As soon as possible
ATM = At the moment
B4N = Bye for now
BAK = Back at keyboard
BBIAB = Be back in a bit
BBL = Be back later or Blocked Bidder List
BBW = Buyer beware
BCNU = Be seeing you
BG = Big grin
BIL = Brother-in-law
BIN = Buy It Now
BRB = Be right back
BTDT = Been there, done that
BTW = By the way
C&P = Copy and paste
CYE = Check eour email
DD = Dear daughter
DF = Dear father
DH = Dear husband
DL = Download
DM = Dear mother
DW = Dear wife
DQMOT = Don’t quote me on this
EU = European Union or Euros (i.e., European currency other than GBPs)
EULA = End User License Agreement
FAQ = Frequently asked questions
F2F = Face to face
FB: Feedback
FIL = Father-in-law
FKA = Formerly Known As (e.g., company was bought, this was their original name)
FWIW = For what it's worth
FUBAR = F****d up beyond all recognition
FYA = For your amusement
FYI = For your information
GBP = Great Britain Pounds (see currency exchange site)
GFY = Good for you
GGBB = Gotta go; bye bye
GL = Good luck
GMTA = Great minds think alike
G2G = Got to go
Googled or googling = Search
GTGB = Got to go; bye
HP = Homepage
HTH = Hope this helps
IC/IAE = In any case / In any event
IIRC = If I recall/remember/recollect correctly
ILU = I love you
IDK = I don't know
IM = Instant message
IMHO = In my humble opinion
IMNSHO = In my not-so-humble opinion
IMO = In my opinion
INALB = I'm not a lawyer but
IOH = I'm outta here
IOW = In other words
IRL = In real life
ISL = I'm still laughing
ITUS = I told you so
JMO = Just my opinion
JK = Just kidding
KIS = Keep it simple
KISS = Keep it simple, stupid
KIT = Keep in touch
KWIM = Know what I mean?
LMAO = Laughing my ass off
LOL = Laughing out loud
LTL = Let's talk later
LTNC = Long time no chat
LTNS = Long time no see
LU = Looking up
MAYB = Maybe
MIL = Mother-in-law
MLAS: My lips are sealed
NARU = Not a Registered User (or No Longer A Registered User)
NIB = New in Box (i.e., new, still in original, manufacturer's package)
NM = Nothing much
NP = No problem
NPB = Non-Paying Bidder
NR = No Reserve
NRN = No reply necessary
NSS = Non-selling seller
NWT = New With Tag (i.e., new; manufacturer's labels or price tags still attached)
NYO = Need your opinion
OIC = Oh, I see
OMG: Oh my gawd
OOAK: One of A kind
OP = Original post or original poster (the opening post/poster in a thread)
OT = Off topic
PDQ = Pretty darn quick
PITA = Pain in the ass
PL = A Pink or a Pinkliner; an eBay staff member who posts a message in a Discussion Board. Messages from eBay staff have a pink header.
PLS = Please
PMFJI = Pardon me for jumping in
POV = Point of view
P&P = Postage & Packaging
RL = Real life
ROTFL = Rolling on the floor laughing
ROTFLMAO = Rolling on the floor laughing my ass off
ROTFLMAOPIMP = Rolling on the floor laughing my off off [and] peeing in my pants
RSN = Real soon now
RT = Real time
RTFM = Read the "fascinating" manual
Sig or siggy = Signature (see also: guidelines for use on discussion boards)
S&H = Shipping & Handling
SIL = Sister-in-law
SNAD = Significantly not as described [dispute]
SNAFU = Situation normal, all fouled up
TIA = Thanks in advance
TOS = Terms of Service
TMI = Too much info
TTFN = Ta ta for now
TTYL = Talk to you later
TTYS = Talk to you soon
TU = Thank you
TX = Thanks
TY = Thank tou
TYVM = Thank you very much
UKW = You know who
U = You
U2 = You too
UPI = Unpaid item dispute
UPS = United Parcel Service
USPS = United States Postal Service
UW = You wish
VR = Virtual reality [computer life, as opposed to real life]
Y = Yes
YBS = You’ll be sorry
YKWIM = You know what I mean?
YMMV = Your mileage may vary [you may get a different outcome]
YW = You’re welcome
WB = Welcome back
W4M = Works for me
WWW = World Wide Web
YGBK = You've got to be kidding

See also Commonly used eBay abbreviations and acronyms

(This Guide was an eBayWiki article created by several eBaysians and is preserved here because the information is worth keeping.  If you have additions, please submit them to me.)