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."
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