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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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Apr 22 Word of the Day
When you eat dirt for the first time and leave your family to build a shack in the woods
Bro since I got dirtpilled on Tuesday I have made sooo many worm friends and made them soo many little houses to get married in. Me? Lonely? No you’re the lonely one u lawn owning freak
via giphy
by ecogoth December 30, 2020
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