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 heryoga pants, you can see her bumstache!
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.
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 bitchesbrown eye and her pencilton-buttstache kept stabbing my balls! I would have to admit though... it was an impressive pencilton-buttstache!