(adjective) hard or erect
as soon as she dropped her underpants, I was up.
by Jake January 16, 2004

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Abbreviation of Under Powered, used commonly in Starcraft 2.
Zergs are so UP
by Saifury September 27, 2010

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shut the f*** up, express displeasure
math homework UP,

mom: "go clean your room"

you: "mom UP"
by farmpartyboy December 11, 2010

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A form of agreeing or calling peopleĀ“s attention to a previous post/comment at a forum/article.
Forum:
Guy: Help me with this stuff!
-no replies-
Guy: up.

Comment on an Article:
I like it so up the damn quote already!
by Akmaur February 05, 2007

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U-ndercover P-artyer Someone who is quiet most the time usually at school but knows how to party on weekends.
Hes a major U.P. NUKKA!
by CHILLZ1127 June 08, 2006

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short for shut the fuck up
also can be used by pointing up...up
Random Person 1: what are you doing later?
Dickhead: Up
by chunksup August 27, 2008

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to be high, usually on marijuana
Wanna go get up man?

Yo, you tryin to get up?
by martin brown October 25, 2006

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Term used by car salesman to describe individuals who walk into their lots for the first time.
Joe took 6 ups today without making a single deal.
by Shahin January 31, 2005

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