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The visible panty line that is formed on the backside of a pair of fullback (granny) panties by the gusset stitching, going from one butt cheek to the other.
Oh man, every time that Nancy bends over when in her yoga pants, you can see her bumstache!
Bumstache by Kah-Kah Bum June 18, 2016

buckstache 

A mustache adorned by fans of The Ohio State University. Sporting a buckstache often leads one to a life of crime and perversion. The buckstache was made famous by the Michigan Wolverine based blog The M Zone. A cousin to the Buckstache is the Warstache, a mustache worn by Auburn fans. The Warstache will lead one to a life of bestiality.
Paul's life took a turn for the worse when he decided to grow a Buckstache.

buttstache 

When the hair in your ass crack is so long, it looks like a mustache.
Hey, Nice Buttstache!!!
buttstache by Scat-lover April 25, 2004

Buckstache 

A mustache that is extremely ugly which acts as a repellent to women and average human beings.
That is one big buckstache
Buckstache by IRP_Hawk December 5, 2010

pencilton-buttstache 

When an anal enthusiast waxes his or her asshole hairs with pomeade in order to have a pencil thin butt hair mustache. One must remove all butt boogers before applying so it glimmers in the light and your lover can truly appreciate the pencilton-buttstache.
I was humping my bitches brown eye and her pencilton-buttstache kept stabbing my balls! I would have to admit though... it was an impressive pencilton-buttstache!

Buttstache 

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."
Buttstache by S-Trip July 23, 2007