A simple acronym meaning Ultimate Bro. Typically used to describe an action that is more beneficial to your friend (bro) than yourself. Can also be a description of a person who performs such acts.
Brian was pretty bro when he got that girls attention for you, but Joel was so UB by getting her number for you.
by DJJaySee November 09, 2011
this means you got an uncontrolable boner!
damn man ive got a u.b
by ice kidd March 31, 2008
An exclamation yelled whilst making a u-turn in an unauthorized, highly dangerous area; often cutting off other motorists minding their own business.
"Holy Shit, you can't turn here...you're gonna wreck that asian kid on the tricycle...watch out... U-B!!!"
by The T. isn't silent. May 06, 2009
Under a Blanket
ON the phone: "Hey Connie, where are you at?"

Connie: "UB"

Me: "oh, you're at home"

Connie: "who said i was at home? i just said i was under a blanket"
by chuck sternobloids January 23, 2009
A contraction of über-Christian; refers to people whose religious beliefs exceed the theoretical boundary of a normal person. Often found condemning heathens or reciting the Bible.
Dude, that chick is smokin' hot! Too bad she's an üb.
by Alex French November 17, 2003
UN-BOYFRIEND. Pronounced EWE-BEE. For a commitment-phobic woman, a UB is a man she is dating but she does not want anyone calling him her "boyfriend." She is often dating (and enjoying) several UBs at once. Of the ilk of friends with benefits or fuck buddies.
Girl_One: She has so many boyfriends, doesn't she?

Girl_Two: Naw, those are her UB's, she's just a cougar who can't commit.
by baconfeet June 01, 2007
A common acronym used to describe an "Unknown Bittie" (aka a fine girl that you do not know personally)
"Dude did you see that Ub over there? Id tear that shit up!"
by Zach Hess August 17, 2007

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