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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
In the great metropolitan city of Seattle we have an ever progressive bus system. But on our wonderfully convenient buses, bums like to wander. In and out they go, winter, summer, spring and fall. Often times they are loony, and speak peaceful gibberish words into your ear. When earphones, sunglasses, and a hood won't shield you from uncomfortable bus chatter and no longer keep you safe from these migrant babblers, you wear the cleverly fashionable BUSTACHE!!

A bustache, is a mustache, that you wear in the bus. (Or anytime that you need to ward off crazies.)
I'm glad I wore my bustache to the Seattle Storm game, it kept me feeling safe and confident during those awkward conversations.
Bustache by chrystih June 25, 2008
Term to define the desconcerting dark hair growth on some womens chests.
'She should NOT wear such low tops'

'I know.. look at her bustache!'
bustache by eggnoglover January 16, 2010

BlueStacks 

A gamer's paradise that can be accessed with a click of a button. It gives users the freedom to play games on their PC or on the Cloud.

Sometimes mistaken with a stack of blue books, is really a stack of millions of games, powerful features, gamer-friendly tech, and an immersive gaming experience.
I love playing Android mobile games on BlueStacks!
BlueStacks by BlueStacksSocial November 24, 2021
an uncommonly known term for the thick and robust hair surrounding ones butt hole.
sweet moses, check out the bustache on that goat licker
bustache by Totally.... July 22, 2007
Coming on a girl's upper lip.
"I came a bustache on her face."
bustache by Cro August 7, 2005