Butt Mustache 

An inordinate amount of hair growing in one’s butt crack near the tailbone

His butt mustache was as thick as Tom Selleck’s facial mustache!

Butt Mustache by Pirate Oncologist May 19, 2022

Panama City butt moustache 

It's a tattoo on your lower back just above your butt crack. A.K.A. Tramp Stamp

OMG girl I love your new Panama City butt moustache.

Those shorts really show off your Panama City butt moustache.

Panama City butt moustache by Southern "lady" December 13, 2012

butt moustache 

The patch of hair that rests directly above the small of a person's back.

Look at that guy's butt moustache!

butt moustache by Matt Wheeler September 8, 2006