Thanks to all the list members who p-mailed their favorites.
Assembled here is an alphabetical list of most of them (with redactions
of most offensive words for those with tender ears):

THIS               MOST LIKELY MEANS THIS

AFAIK          As far as I know
AFM             Air flow meter
AITYD          And I think you do
AKA             Also known as
ASAP           As soon as possible
BBL              Be back later
BION            Believe it or not
BMF             Biting my fingernails
BRB              Be right back
BTDT           Been there done that
BTW            By the way
DPO             Dreaded (or dumb) prior owner
DVM            Digital volt meter
ECU             Engine control unit
FAQ             Frequently asked questions
FLAPS         Friendly local auto parts store
FWIW          For what it's worth
FYI               For your information
GDR            Grinning, ducking & running
HTH            Hope this helps
IANAL         I am not a lawyer (also IANACPA, etc.)
IIRC            If I recall correctly
IDK              I don't know
IMO             In my opinion (what it says)
IMHO           In my humble opinion (I believe I know what I'm talking
about)
IMNSHO       In my not so humble opinion (I'm an authority on the
subject)
IYKWIM       If you know what I mean (sometimes followed with AITYD, see
above)
IRL               In real life
IOW              In other words
ISCU             Idle stabilization control unit
JC                  Just curious
JIC                 Just in case
KISS              Keep it simple stupid
LOL               Laughing out loud
NOS              New old stock, i.e. unused but made a long time ago
NRN              No reply necessary
OBO              Or best offer
OTOH           On the other hand
OXS              Oxygen sensor
PO                 Previous owner
POC              Piece of crap
POS               Piece of sh__
PS                  Postscript
ROTFLMAO  Rolling on the floor laughing my ass off
RSN               Real soon now (usually used sarcastically)
RTFM            Read the fu_____ manual
SITD              Still in the dark
SNAFU          Situation normal all fu____ up
SO                 Significant other
SOL               Sh__ out of luck
SOHF            Sense of humor failure
SPAM           Single post annoyance mail
SWAK          Sealed with a kiss
TPTB           The powers that be
TIA              Thanks in advance
TIC              Tongue in cheek
TNSTAAFL There's no such thing as a free lunch
TTFN           Ta-ta for now
TTYL           Talk to you later
VOM            Volt-ohm-meter (usually a DVM these days)
WEG            Wicked evil grin
WIP              Work in progress
WRT            With respect to
WYSIWYG  What you see is what you get
YMMV         Your mileage may vary
YWIA           You're welcome in advance

Tom LaLanne
'86 Subie Westy