Can't understand what your kid is saying online?  Join the club!  Here are some of the most common acronyms used:

LOL - Laughing out loud
ROFL - Rolling on floor laughing
JK - Just kidding


GF - Girlfriend
BF - Boyfriend
BFF - Best friend forever

BRB - Be right back
AFK - Away from keyboard
BAK - Back at keyboard


IMO - In my opinion
IMHO - In my humble opinion


OMG - Oh my God
WTH - What the hell
WTF- What the f***

PIR - Parent in room
POS - Parent over shoulder
PRW - Parents are watching
MIR – Mom in room
And variations for Mom and Dad

and here is a more complete list of all the acronyms out there online:

AAMOF - As A Matter Of Fact
AFAIK - As Far As I Know
AWGTHTGTTA - Are We Going To Have To Go Through This Again? Alternative form is AWGTHTGTATA (...Through ALL This Again?)
BBFN - Bye Bye For Now
BIOYIOP - Blow It Out Your Input Output Port
BRB - Be Right Back (generally used on chat systems)
BTA - But Then Again
BTW - By The Way
BYKT - But You Knew That
BYKTA - But You Knew That Already
CC - Conference Coordinator
CH - Conference Host
CMIIW - Correct Me If I'm Wrong
CYL S- ee You Later
DNPM - Darn Near P***ed Myself
EOD - End Of Discussion
EOL - End Of Lecture
ESOSL - Endless Snorts of Stupid Laughter
FDROTFL - Falling Down Rolling On The Floor Laughing
FITB - Fill In The Blank....
FOTCL - Falling Off The Chair Laughing
FWIW - For What It's Worth
FYI - For Your Information
GD&R - Grin, Duck & Run
GOK - God Only Knows
IAC - In Any Case
IMCDO - In My Conceited Dogmatic Opinion
IMHO - In My Humble Opinion
IMNSHO I- n My Not So Humble Opinion
IMO - In My Opinion
IOW - In Other Words
IITYWYBMAB - If I Tell You, Will You Buy Me A Beer
IITYWYBAD - If I Tell You, Will You Buy Another Drink
INPO - In No Particular Order
KCBIWIYWI - Keep Coming Back, It Works If You Work It
L8R - Later
LLTA - Lots and Lots of Thunderous (or Thundering) Applause
LOL - Laughing out loud
LMAO - Laughing My A** Off
MUNG - Mash Until No Good
NICBDAT - Nothing Is Certain But Death And Taxes
NIMBY - Not In My Backyard
NIMTO - Not In My Term of Office
NPLU - Not People Like Us
NQOS - Not Quite Our Sort
OIC - OH!, I See
OTOH - On The Other Hand
PGY - Post Graduate year PGY-1, PGY-2 etc. used in PGY Med.
PMETC - Pardon Me Etc.
PMYMHMMFSWGAD - Pardon Me, You Must Have Mistaken Me For Someone Who Gives A Damn.
PTO - Patent and Trademark Office (US Govt)
R/O - Receiver Only
ROFL - Rolling On Floor Laughing
ROFLAHMSL - Rolling On Floor Laughing And Holding My Sides Laughing
ROTBA - Reality On The Blink Again
ROTFL - Rolling On The Floor Laughing
ROFLASTC
(or ROFLASC) - Rolling On The Floor Laughing And Scaring The Cat
ROTFLMAAOBPO - Rolling On The Floor Laughing My A** And Other Body Parts Off
ROTM - Right On The Money
ROY G. BIV - An acronym for the colors of the spectrum-- Red Orange Yellow Green Blue Indigo Violet
RSN - Real Soon Now
RTFM - Read The F**** Manual
SIG - Special Interest Group
SWAG - Simple Wild A** Guess
SYT - Sweet Young Thing
TANJ - There Ain't No Justice
TANSTAAFL - There Ain't No Such Thing As A Free Lunch
TTFN - Ta Ta For Now
TIC - Tongue In Cheek
TINALO - This Is Not A Legal Opinion
TINAR - This Is Not A Recommendation
TIWTGLGG - This Is Where The Goofy Little Grin Goes
TJATAW - Truth, Justice, And The American Way
TLA - Three Letter Acronym
TRDMC - Tears Running Down My Cheeks
TTBOMK - To The Best Of My Knowledge
TTFN - Ta Ta For Now
TTMS T- alk (Type) To Me Soon
TTYL - Talk To You Later
TTYL(A) T- alk (Type) To You Later (Alligator)
TYVM - Thank You Very Much
WAMKSAM - Why Are My Kids (or Kitties) Staring At Me?
WIBAMU - Well I'll be a Monkey's Uncle
WYSBYGI - What You See Before You Get It
WYSIWYG - What You See Is What You Get
YAP - Yet Another Ploy
YMMV - Your Mileage May Vary