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1.
not honest; bull-shit; someone disposed to lie, cheat, or steal; not worthy of trust or belief.
Him: "I swear I didn't sleep with her, baby!"
Her: "You're so mustaches!"

"You know that kid Rick? He's such a f***ing mustache."
by Isabella Hunter March 19, 2009
 
2.
Tuft hair above the upper lip and below the nose. Usually longer than the rest of the hair on the face and he has no goatee only a mustach.
Stephen has a mustach that he like to gel up.
by Nvode November 27, 2004