A directional move used in Super Smash Bros to achieve extra height after a double jump.
Kirby used his Up B to get back onto the level.
by Balls Kolano October 9, 2008
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Amanda says: What up B?
Shellee says: notta girlie what it is ?
by Shellee July 4, 2006
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Verb used to describe the act of randomly bailing from any situation with no explanation or reason.
"Hey, where did Brewy go?"
"I dunno man; I think he just Up-and-B'd!"

"Fuck it, Imma Up-and-B this shit."
by Red Leather April 4, 2010
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B Up A. Refers to Modern Warfare (MW2, COD4, World at War). It means to "give up" or "tap out" and back out of the lobby before the game starts. You can tell someone to "Bupa" (sounds like "Boopa") if you want them to leave.
Example 1:"Man, you guys have no skill- you keep using your noob tubes". "Noob tubes? These are pro pipes. B UP A"

Example 2: "I don't noob tube, I bro-pipe!"
by Noob Tuber March 31, 2010
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When smash bros players for example Link or Palutena can up b every now and then to keep the opponent away from them.
Shit this ganondorf got me cornered I gotta up b to keep em away from me
by Kxrey July 4, 2023
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To commit suicide. Comes from the shortcut to delete your save file in older Pokemon games.
I'm about to Up-Select-B.
by AtlanticComputer October 13, 2020
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