Abbreviations:
Similar to the emoticons that convey feelings with only a few keystrokes, the internet and text messaging use of abbreviations has become widespread. Some terms have become so common as to be found in emails (even of broadband users), television commercials, or sometimes ... conversations.

ADHD
AFAIK
AISB
ASAP

B4
BBIAF
BBIAM
BBL
BBN
BC
BEG
BLVD
BLM
BML
BOL
BRB
BRBIGGAT
BROS
BTW
BWL

CMIIW
CMON
CUL
CWYL
CYA

DEGT
Dnt B L8
DRT
DTS

EG
ELOL

F2F
FAQ
FOCL
FOMCL
FSD
FWIW
FYI

GA
GB
GFI
GG
GIAR
GMTA

HAGN
HAGO
HCIERY
HHIS
HRU

IAC
IB
ICBW
IDK
IDTS
IMHO
IMO
IRL
IRMC
ItsU
ITYFIR
IUSS
IW
IYKWIM
IYO

JADB
JAS
JJA
JK
JTUMLTK

LDTO
LHO
LOFLOL
LOL
LSHIH
LSHMSH
LTMS
LTNS
LTS
LUAC

NMH
NP
NRN
NSD
NTFL
NW

OLL
OMG
OO
OOC
OOTD
OTOH
OTTOMH

PMFI
POAHF
PSB
PSG
PTL
PXT

RA
RAS
RL
RME
ROFL
ROFLOL
ROFUTS
ROGLOL
ROTFLSTC
ROTFLSTCIIHO

RPG
RYL

SBD
SHID
SMHID
SNAFU
SOI
SOL
SOT
SOTMG
SPST
SSDD
STBID
SUITM
SUL
SUP
SUPERCA
SUS
SYITM
SYL
SYUTH
SYWWTBY

TABA
TC
THX
TIA
TIIC
TMI
TMSD
TMWFI
TPTB
TTFN
TTS
TTTT
TTYL
TTYL8R
TTYS
TVB
TWT
TY
TYT
TYVM

UGTBK
UNT
UR TH WKEST LNK - GDBY
UTFL

VM

WAM
WAYF
WB
WBRB
WEG
WFHC
WFR
WTB
WTG
WTH
WTMPI
WTV
WYSIWYG
WUWT
WWYC
WYM
XFER
XING
XMAS
XTRA

YBS
YDKTPOTDS
YG
YGB
YGBKM
YGG
YGTBK
YIAH
YMMV

YW
YYSSLIBTO
YYSSW

Attention Deficit Hyperactive Disorder
As Far As I Know
As It Should Be
As soon as possible

Before
Be Back In A Few
Be Back In A Minute
Be back later
Bye Bye Now
Because
Big Evil Grin
Boulevard
Blonde Moment
Biting My Lip
Best Of Luck
Be right back
Be Right Back I Gotta Get A Towel
Brothers
By the way
Bursting With Laughter

Correct Me If I'm Wrong
Come On
Call You Later
Chat With You Later
See ya!

Don't Even Go There
Don't Be Late
Dead Right There
Don't Think So

Evil Grin
Evil Laughing Out Loud

Face to face
Frequently asked questions
Fell Off Chair Laughing
Fell Out Of My Chair Laughing
Fools Seldom Differ
For what it's worth
For your information

Go Ahead
Goodbye
Go For It
Gotta Go
Give It A Rest
Great Minds Think Alike

Have a Good Night
Have A Good One
How Can I Ever Repay You
Hanging Head In Shame
How Are You

In Any Case
I'm Back
It Could Be Worse
I Don't Know
I Don't Think So
In my humble opinion
In my opinion
In real life
I Rest My Case
It Is You
I Think You'll Find I'm Right
If You Say So
It's Worse
If You Know What I Mean
In Your Opinion

Just Another Drive By
Just A Sec
Just Joking Around
Just Kidding
Just Thought You Might Like To Know

Let's Ditch This One
Laughing Head Off
Lying On the Floor Laughing Out Loud
Laughing out loud
Laughing So Hard It Hurts
Laughing So Hard My Sides Hurt
Laughing To Myself
Long Time No See
Laughing To Self
Lighting Up A Cigarette

Not Much Here
No Problem
No Response Necessary
Never Say Die
No Time For Love
No Way

Only Laughing a Little
Oh My God
Over and Out
Out Of Character
One Of These Days
On the other hand
Off The Top Of My Head

Problem Magically Fixed Itself
Put On A Happy Face
Pretty Stupid Boy
Pretty Stupid Girl
Praise The Lord
Please Explain That

Red Alert
Running Around Screaming
Real Life
Rolling My Eyes
Rolling on floor laughing
Rolling On the Floor Laughing Out Loud
Rolling On Floor Unable To Speak
Rolling On The Ground Laughing Out Loud
Rolling On The Floor Laughing - Scaring The Cat
Rolling On The Floor Laughing - Scaring The Cat If I Had One
Role Playing Games
Read You Later (new equivalent to See you later)

Silent But Deadly
Slaps Head In Disgust
Scratching My Head In Disbelief
Situation Normal - All Fouled Up
State Of Insanity
Simply Out of Luck
Short Of Time
Short Of Time Must Go
Same Place Same Time
Same Stuff Different Day
Sometime Before I Die
See You In The Morning
See You Later
What's Up?
SUPERCAlifragilisticexpealidocious
See You Soon
See You In The Morning
See You Later
Smack You Upside The Head
See Ya Wouldn't Want To Be Ya

Throws A Beer At
Take Care
Thanks
Thanks in advance
Those Idiots In Control
Too much information
Tiny Minds Seldom Differ
Take My Word For It
The Powers That Be
Ta ta for now
Text - To - Speech
These Things Take Time
Talk To Ya Later
Talk to you later
Talk To You Soon
Top Versus Bottom
Time Will Tell
Thank You
Take Your Time
Thank You Very Much

You've Got To Be Kidding
Until Next Time
You Are The Weakest Link Goodbye

Use The Force Luke

Voice Message

Wait A Minute
Where Are You From
Welcome Back
Won't Be Right Back
Wicked Evil Grin
What For How Come
Waiting For Reply
Where's The Beef
Way To Go
What The Heck
Way Too Much Personal Information
Watching TV
What You See Is What You Get
What's Up With That?
Write When You Can
What You Mean
Transfer
Crossing
Christmas
Extra

You'll Be Sorry
You Don't Know The Power Of The Dark Side
Young Gentleman
You Go Boy
You Gotta Be Kidding Me
You Go Girl
You Got To Be Kidding
Yes I Am Here
Your Mileage May Vary (you may not have the same luck as I did)
You're Welcome
Yeah Yeah Sure Sure Like I Believe That One
Yeah Yeah Sure Sure Whatever