When you place your ballsack across someone's upper lip. If done correctly, your cock should rest on their forehead.
While Mary was giving me a blowjob I decided to surprise her with a ballstache.
by Stiffboy May 08, 2005
A mustache for your balls.
Who wants a brazilian when you can have a ballstache?
by Erdmanstein February 11, 2011
when kicked in the balls so hard that one comes out of each nostril. Therefore the pair has migrated to the upper lip area creating a stache of balls or ballstache.
Joselo is going to have a ballstache if he insults my mother one more time
by Jilly Mulsprigs October 03, 2007