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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
Chat lingo for, parent over shoulder.
Me: Hey, sup?
You: Nm
Me: g2g pos ttyl
You: k lata buhbye
by A piece of shit October 22, 2003
Originated from a shortening of "Piece of Shit", meaning something/and/or someone that is really shit.
oi that Natasha girl is a POS
by Helzdawg October 07, 2010
Parent over shoulder

like if your trying to have a conversation on msn and your mom just walks in and starts reading it and its something you really dont want them to know about ... x
Girl 1: Hey babe. It was funny today wasn't it LMFAO :P What happened with that guy then did you do anything?

Girl 2: Hya. I'll text you. POS

Girl 2 texts Girl 1...

TEXT: Hey babee, sorry aboutt that, mum was lookiin over me readiin the conversation again x Ov course sumthin happened hes absolute livvin pukka!!! Anyway TTUL <3 x
by absoluteelivvinpukka November 02, 2009
POS stands for piece of shit and is helpful in calling your friends a piece of shit because you can just say POS prounced PAWZ
Ed, Mike, Tom, David, Allen, and Erick are all POS's (plural form)
by Erick Liang October 13, 2006
Although standing for 'Peice Of Shit', pos is an offshoot for a universal adjective to describe someone in a negative way or it can also just be used as a noun that is the equivalent to calling someone a negative name.
Adj. Look at that Pos Nub camping...im bout to pwn him.

Noun. He was supposed to pick me up but he never did. What a pos.
by Dustin Weber May 20, 2003
Yes it IS an abbreviation, but it means Piece of Shit.

Tis Quite simple to understand.
"This film is a POS"

"You are an idiotic POS"
by Aaron July 11, 2005