Mustache Cheese
The smearing of the cheese like substance found inside the labia on the mustache of the male.
Gillie: Hey friend you're mustache cheese looks great.
Friend: Yea my lady friend has a great vagina.
Friend: Yea my lady friend has a great vagina.
Cheese mustache
The act of slapping your un-circumcised dick against your partners upper lip and leaving a trail of "smegma" behind, to create a "cheese mustache".
Bill bring your un-circ over here and give me a cheese mustache