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1.
a mustache that is so ingrained with white trash DNA, it grows in weak, with only a small number of thin hairs as compared to a normal mustache. I.E.-Cletus the slack-jawwed yokel has a crustache.
Like my crustache?
by Bizarrett February 04, 2003
 
2.
The pathetic looking prepubescent mustache sported by boy bands and male high school students intended to impress women, while drawing only jeers and snickers. See peach fuzz.
Zach's dad finally made him Nair his crustache, he looked like a queer!
by BFish December 11, 2002
 
3.
A poorly grown mustache that accurs from lack of motivation to shave.

Also present on boys entering puberty. In which case it is grown to the fullest extent and shown off to there peers.
"dude did see tommy's crustache it totally awesome." "i cant wait for mine to grow in."

"hes kinda cute but whats with the crustache."

"nice crustashe lazy ass."
by hexnfx August 05, 2009
 
4.
A crusty, messy, weird looking mustache.
Mustaches that have lint and crumbs in them.
Guy 1: "See that geezer over there?"
Guy 2: "Yeah, what about him?"
Guy 1: "See all those crumbs in his mustache? Now that, my friend, is a crustache."
by »AJH« July 19, 2010
 
5.
with handle bar mustache
that crusty guy with the mustache is known as crustache
by bluejack69 April 18, 2010
 
6.
See also: six-stringer (which is also related to comb overs)
those inbred white trash kids who were harassing that fey guy were both sporting crustaches - go figure
by Stan the Man December 12, 2004
 
7.
A term invented by Bobby Veto to describe the dried remnants left in a mustache after you've performed oral sex on a woman. A crusty mustache.
I had to put Saran wrap on my upper-lip before I took a shower so it wouldn't ruin my crustache.
by Porgy McDuffin June 25, 2007