The patch of hair that rests directly above the small of a person's back.
Look at that guy's butt moustache!
by Matt Wheeler September 8, 2006
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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.
by Southern "lady" June 5, 2012
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