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The patch of hair at the base of the spine, just above the start of the butt crack. Usually found on men. Resembles a traditional bush, just located on the opposite side.
Ex) That guy's pants were hanging so low, I saw his butt bush.

Ex) He's so hairy...he needs to wax his butt bush!
butt bush by Julia76 May 5, 2008
When a Person has a lot of hair in their butt crack
yo, that chick bent over, and I totally saw a fat butt bush!!! NOT O.K.!!!
Butt Bush by AMHOANG April 6, 2011

bush butt fuck 

bush butt fuck by NATAS666 September 20, 2006

Bushman butt

It's a voluptuous, protruding butt on an otherwise skinny person. The Bushman in Southern Africa have this build to help sustain them in the desert.
She's really skinny except for her protruding Bushman Butt! I can't fit my Bushman Butt into my skinny jeans after my holiday!
Bushman butt by Geewizgc October 7, 2017

buttbush 

When your actual asscrack between the two cheeks is intensely hairy.
Girlfriend: "Dude Conor you got one massive Buttbush going on there"
buttbush by Conor Quinn October 9, 2007