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Butt Sack 

A flap of skin, similar to a nutsack (without the nuts), that dangles from the inside of the asshole to the outside.
Be careful not to sit on your butt sack. That would be painful.
Butt Sack by AlpenWolfer May 10, 2021

butt sack 

you sir are a "butt sack"
butt sack by butsack March 9, 2024

Buttback 

When you fuck up the lower part of your back, but it ain't the butt, but it feels like your ass and back have fused with pain.
"Bruh my buttback be hurting me"
Buttback by Crimsonfucker1782 August 2, 2024