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1.
A hairstyle below the male midriff, which consists of the pubic hair above the penis being completely shaven, and the testicles left unshaven, with hair. The genitalia will then be comparable to a mustache, as the penis acts as the nose.
He said he started out shaving his pubes above my penis, and when he finished and was about to start the balls, he realized it looked kind good, so he a dick mustache.
by TangClock March 06, 2009
 
2.
A fraternity prank similar to a teabag where you lay your penis across the upper lip of an unconscious person, often documented with a photograph
Some freshman got all loaded and passed out by ten, so we gave him a dick mustache.
by Mark VZ April 04, 2006