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1.
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."
af S-Trip 23. juni 2007
 
2.
When the hair in your ass crack is so long, it looks like a mustache.
Hey, Nice Buttstache!!!
af Scat-lover 25. april 2004
 
3.
The collection of hair around and atop the asshole. Forming a moustache of sorts on the butt.
"Damn bro, nice buttstache."
af labia lightnin 3. januar 2007
 
4.
A hairy, unkept bum.
That girl should not be wearing a thong at the beach, she obviously hasn't waxed her buttstache in months.
af sara r. 8. august 2005
 
5.
Similar to a moustache, but instead of being on a mans upper lip a 'butt-stache' is the patch of hair found just above a mans butt crack.
quote "baby, you gotta shave your butt-stache"
af Joe Magnuson 5. april 2007