To "pop a B" simply means that you have an erection.
The "B" stands for boner, another word for an erection.

I have no idea how I came up with this, I just started saying it and it sounded catchy and very urban.
Dude, I'm poppin' a B right now cause this girl is so hot!
by shyguy91 February 22, 2011
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To "pop a b" means to get an erection.
Bhagwat: Whenever I think about Meredith, I start poppin' b's left and right!
by herr0prease March 31, 2010
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Slang for asking someone how they are whilst copping a pair of Timbs along with a Yankees hat and Camo joggers.
John - Hey mans
Sam - Wus poppin' B?
John - Yeah, me and my dog just finished puffing on a loosie
Sam - Yo filthy ass
by dogmiester October 20, 2016
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When one street n**** goes up to another street n**** and says wus poppin b is street Lang for Hi
Street n**** 1 : Wus poppin b
Street n**** 2: Notin b wus poppin wit chu
by BigRigNig April 19, 2017
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Used to replace any word with a beginning letter of b. Bro, Babe, bae, etc.
by FlyingTiger455 August 30, 2017
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Commonly used as a greeting/text. Can be extremely cringey at times, however if it used ironically, it's ok. 'B' is short for, 'Babe', 'Bae', 'BB' and so on.
Boy: Hey, what's poppin b? X

Girl: Um, your a bit fucking weird.
by What's good my dood March 1, 2017
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Boy: Yo wuss poppin b?
Friend: nothing much
by Datboi67 February 27, 2017
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