Code phrases are commonly used in text messages and online chats.

While "P911," may not mean anything to the over-30 set, many kids knows exactly what it means: "My parent just walked into the room, and we need to stop talking about what we don't want them to know."

Instant message acronyms, or IM codes, are being used by teens across the world to keep parents clueless.

Recently, Eyewitness News gathered 20 of the most popular codes and set out to see if parents and teens were on the same page. While most teens recognized the IM codes, parents were far less knowledgeable about the online alphabet soup.

So, here's 20 of the most common IM codes and what they mean:

POS - Parents Over Shoulder
PIR - Parents In Room
P911 - Parent Alert
PWA - Parents Are Watching
PAL - Parents Are Listening
ASL - Age, Sex and Location?
MorF - Male or Female?
SorG - Straight or Gay?
LMIRL - Lets Meet In Real Life
KPC - Keeping Parents Clueless
TD2M - Talk Dirty To Me
IWSN - I Want Sex Now
NIFOC - Nude In Front Of Computer
GYPO - Get Your Pants Off
ADR - Address?
WYCM - Will You Call Me?
KFU - Kisses For You
MOOS - Member Of Opposite Sex
MOSS - Member Of Same Sex
NALOPKT - Not A Lot Of People Know This