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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."
P.O.S. by Alan Nguyen December 20, 2004
man, this car is a p.o.s!
p.o.s by Eugarth Mansicken January 23, 2005

Obama O's 

An experimental cereal Kelloggs is creating to promote Obama's existence to small children. None is known about Obama O's, but it will be featuring Joe Biden marshmallow heads!
Mother: Baby Gerald! I bought you a new experimental cereal! Obama O's! I want you to know of Obama's existance!

Obama O's by BILLY STEEL! March 24, 2009

O.S. The Best 

A common name used to describe someone that is very sensitive. "O" stands for "Over" and "S" stands for "Sensitive"
Guy 1: Did you see that guy cry in the movies?

Guy 2: Yea he is O.S. The Best

Guy 1: Exactly
O.S. The Best by Boinkin Her February 13, 2010
Underground Alternative hip-hop artist from Minneapolis, Minnesota. He's on Doomtree and Rhymesayers. He was originally a punk rock artist, and didn't like rap, however he realized it's an alternative form of expression.

P.O.S can stand for many things, such as Piece of Shit, Product of Society, Pissed off Stef, Promise of Skill, and Promise of Stress. He says it stands for whatever fits the song.

As of June 2010, he has three albums: Ipecac Neat, Audition, and Never Better
Mercedes: "Who's the amazing man rapping this song, who's the amazing bassist, and who's the fucking awesome drummer?"
Jack: "That's P.O.S."
Mercedes: "Who's P.O.S?"
Jack: "A rapper coming from of the Great State of Minnesota."
P.O.S by WhosHos June 24, 2010
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...
P.O.S. by Resa May 25, 2006