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2. B up
kicking one's ass, referring to the action of jumping and attacking in the game Super Smash Brothers.
AKA: MEGA RAPE
Fox and Mario enter, Mario is the only contender left...
Mario: "I just B upped yo ass"
1. b up
Sometimes used for blaze up (smoke).

Like it if you want, some people say it.

Most of the time used on statuses for stuff like aim, msn, whatever.
Dave's status: AFK... b up
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