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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!"
B up A by Noob Tuber March 31, 2010
Related Words
Bitch ben B-Randon BOB bruh beautiful BTS beans bella banana
Look at b-walt
i know...beast.
b-walt by naappayyy December 11, 2010
B-52s are the fat cats at parties and clubs who can get almost any girl they want because of their payload (money). Normally they're harmless and tend to hang around and flaunt their payload for kicks, just like in the Cold War. They can be a subclass of bogey.

Having a B-52 at your side can be helpful, especially when you're approaching a large group of all hot girls and the B-52 is needed to impress the group, and take the bitchy girls (whose bitchiness will by annihilated by the B-52 payload), leaving you with whichever hot girls remaining. DO NOT use a B-52 on a group of 1 to 3 hot girls since that would be overkill; he'll end up with all the girls and you'll be stuck with nothing.

There is a special kind of B-52 known as a Major Kong. A Major Kong is extremely confident and will hit on any girl (single or not) and may succeed in taking your girl. Besides being hard to bring down (humiliate), you'll need as much backup as you can, preferably the entire squadron, to bring down a Major Kong before he does any damage. Even when he goes down, he'll still use his payload as a last resort, so early interception is an absolute must.
Wingman: Bro, I think we've got a bogey here

Leadman: Yeah, you're right. It looks like they're hitting it off. I'm gonna intercept.

Wingman: I'll back you up.

Leadman: No need bro. I'll let him know she's dating me and he'll back off.

Wingman: Dude, look his Louis Vuitton suit. He's definitely a B-52.
B-52 by The Nataraja January 4, 2011
Used a lot in ghetto memes
Example: Hey Beter
Jimmy neutron: hey Beter <that's a B emoji
Peter(family guy): yes jimmy neutron from jimmy neutron?
Jimmy neutron: Your PETARDED
Peter(family guy): HOLD THE MAYO!!!
Holy crap follow for free iphone 4
B emoji by thicc_robot August 27, 2017

B-Baller 

“Yo see that B-Baller over there he hella hot

“Jordan’s are B-Baller shoes”
B-Baller by Miriamelkinani May 15, 2018
(n.) A weed-smoking device consisting of (usually) a pitcher and a 2 liter soda bottle with a socket-wrench socket into the lid as a bowl.
"Hey Dustin, stop smoking tobacco out of the B-Set before you kill us all."
B-Set by Avirexii February 4, 2019