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1.
A creepy mustache.. aka.. creepstache.
Ew, shave your creepstache
by EricaApathy March 15, 2006
 
2.
The mustache commonly worn by creepers.

A creepy looking mustache.
A creepy looking mustache on a creeper.
Jennie: Have you seen Michael?
Andee: You mean the one with the creepstache?
Jennie: Yeah!
by Yumm&Llama Lady November 15, 2011