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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
Related Words

backstache 

Male back hair which may be manscaped into a decorative form or left au natural. The Fu Manchu backstache is when the tops of the shoulders are hairy, as are the sides of the back (covering part of the shoulderblades), but the center of the back is clean.
So we went to the beach, and Jim took off his shirt to reveal a backstache. It was terrifying in its raw manliness.
backstache by Backstache hero December 9, 2008

Cing Buchacacha 

The real king of poompaloompas and lmno. his left-hand man is Jimbow Jimbobble. his right-hand man is Harold the magnificent horse the magnificent. King Buchacacha is a fraud and not to be mistaken for Cing Buchacacha. King buchacacha is Wonky wills middle and a have hand man. therefore, he is very bad. also, his nick name is C.B.
Jimbow Jimbobble: hey King buchacacha where are you
Cing Buchacacha: HOW DARE YOU SAY KING BUCHACACHA HE IS WONKY WILLS MIDDLE AND A HAVE HAND MAN NOW YOU MUST SUFFORE
Jimbow Jimbobble: NO NO I TAKE IT BACK C.B.
Cing Buchacacha: oh ok your fine now
Cing Buchacacha by Cing Buchacacha December 17, 2021

buchiach 

That girl Nicki is a little buchiach.
buchiach by Captain Fantastic November 7, 2003

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