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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
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9
This is teenage Instant Messaging slang meaning "Parent Over Shoulder". It tells the other user the their mother/father is standing over them, and to not say anything that might get them into trouble.
Girl 1: LYKE OMG TYLE IS LYKE DA HOTEST GUY IN DA HOLE WORLD!!!!1!1
Girl 2: P.O.S.
Girl 1: can u help me wid my english hw?
Girl 2: sure, wat pg is on?
....
Girl 2: KK, hes gone
Girl 1: I can tell tyler wants meh, he wus starin at meh b00bs in eenglish class...
by Resa May 19, 2006
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10
It means piece of shit, and you use it towards anything that is worthless.
by lunar shadows December 29, 2004
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12
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
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13
Anyone muscular whose afraid of doing something
"Your a POS, why are you afraid of roller coasters"
by Slurpeeshots June 25, 2015
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