This is from an article in USA Today, linked below.
http://www.usatoday.com/story/tech/columnist/komando/2015/01/02/texting-acronyms-parents/21098099/?csp=tech
Your kid has something to hide
CD9: Short for "Code 9," which means parents are around.
KPC: Keeping Parents Clueless
MOS: Mom Over Shoulder
P911: Parent Alert
PAL: Parents Are Listening
PAW: Parents Are Watching
PIR: Parent In Room
POS: Parent Over Shoulder
Your kid's personal information or safety is at risk
ASL: Age/Sex/Location
F2F: Face to Face. Asking for a meeting or video chat
LMIRL: Let's Meet In Real Life
NAZ: Name/Address/ZIP
MOOS: Member of the Opposite Sex
MOSS: Member of the Same Sex
MORF or RUMORF: Male or Female, or Are Your Male or Female?
RU/18: Are You Over 18?
WUF: Where You From?
WYCM: Will You Call Me?
WYRN: What's Your Real Name?
Your kid shouldn't be involved in this
143, 459 or ILU: I love you
1174: Invited to a wild party
420: Marijuana
GNOC: Get Naked On Cam
GYPO: Get Your Pants Off
AMEZRU: I Am Easy, Are You?
IWSN: I Want Sex Now
KFY or K4Y: Kiss For You
KOTL: Kiss On The Lips
NIFOC: Nude In Front Of The Computer
RUH: Are You Horny?
TDTM: Talk Dirty To Me
Not every acronym is bad
BRB: Be Right Back
CWYL: Chat With You Later
CYT: See You Tomorrow
IMHO: In My Humble Opinion
IMNSHO: In My Not So Humble Opinion
L8R: Later
LMK: Let Me Know
NM: Never Mind
ROTFL: Rolling On The Floor Laughing
SOHF: Sense Of Humor Failure