Popping your butt knuckle

Farting or getting raped in the ass by a large shemale.
Dude that one website you sent me to last night was digusting, I didn't know shemales could be Popping your butt knuckle.
by UF Omega September 13, 2011
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Pop a Knuckle

The act of inserting a finger into one's anus, usually down to the knuckle.
I'm gonna pop a knuckle in!
by CellularSoul August 04, 2025
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