1) An abnormal amount of hair in the butt area.

2) Anyone or anything that has the aforesaid abnormal amount of hair in the butt region.
1) " wow did you see anthony's buttstache? it is soooo nasty."

2)" holy macaroni, chris is one giant buttstache."
by S-Trip June 23, 2007
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The collection of hair around and atop the asshole. Forming a moustache of sorts on the butt.
by labia lightnin January 03, 2007
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The hair directly surrounding the anus or when the hair around the anus forms into a mustache shape.
When he spread his butt cheeks, his Buttstache was staring me right in the face.

I wanted to eat the booty like groceries, but the bitch had a nasty Buttstache.
by AesopFables November 29, 2015
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A hairy, unkept bum.
That girl should not be wearing a thong at the beach, she obviously hasn't waxed her buttstache in months.
by sara r. August 08, 2005
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The buttstache occurs when a dude and a bitch are 69'ing and the bitch (or dude) farts directly on your lips and nose, causing the fart wind mustache "The Buttstache
friend 1: "This was fucking gross bro, I was going down on this bitch and she was suckin ma dick, all of a sudden, she ripped a fat one right on my face!" freind 2: "Ew what the fuck? It was the Buttstache"
by M-CsmackAbitch October 08, 2008
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