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50.
POS
Means, Parents on shoulder. It is used to tell the person you are talking to that your mom or dad is around and/or looking, so they don't type anything that your parents wouldn't want to see.

iSaBeLla<3: OMG i gave cody a bj last nite!!!
S.A.R.A.H: pos
iSaBeLla<3: wad was the answer to question 4 in the textbook for science?
S.A.R.A.H: ok my mom is gone
S.A.R.A.H: OMG realli how was it?!?!, was his dick big?
iSaBeLla<3: it was fucking awesome! it was the biggest dick i ever seen!!!
by lil' slutty cheerleader April 12, 2009
 
1.
pos
1) Piece Of Shit
2) an abbreviation some companies use for Positively Outstanding Service.
If you would clean that POS off the floor, that would really be a demonstration of POS. Hell, I'd promote you!
by Nick D May 17, 2003
 
2.
POS
1. Piece of Shit
2. Parent Over Shoulder
3. Positively Outstanding Service
do I really have to put in an example?
by Enterthedavid June 20, 2005
 
3.
pos
Another gay instant messenger abbreviation created by losers with no life. Means "parent over shoulder." Used to tell the other person that your mom/dad is looking so don't type anything you wouldn't want them to see.
ChEeRcHiCk289: omg lyk u no who is lyk so hott?
SeXiPriNcEsS542: pos
ChEeRcHiCk289: um....what is our math homework
SeXiPriNcEsS: ok he left
ChEeRcHiCk289: oMg! josh is soOo hott and i gave him head yesterday because im a slutty little cheerleader!
by Asshole November 08, 2003
 
4.
POS
piece of shit
Look at that POS!
by Speedfreak January 01, 2004
 
5.
pos
It means piece of shit, and you use it towards anything that is worthless.
Aol is a prime example
by lunar shadows December 29, 2004
 
6.
PoS
Piece of shit.
"His new car is such a pos"
by Matthew Savva March 20, 2003
 
7.
Used as a subsitute for the saying "Piece of shit"

Describes a not so appealing object or person.

Does not always need to have "a" before "P.O.S." in short, you don't need to say "Thats a P.O.S." you can just say, "Thats P.O.S."
"Dude, that chick looks like P.O.S."

"That smells like P.O.S."
by Alan Nguyen December 20, 2004