When a man with a mustache jerks off too violently and cums all over his lip fur.
Joe came to work today with a dirty mustache, he must have forgotten to clean up when he was done.
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When a person gains the ability to grow a mustache but it's thin and patchy.
John: " Ugh! I wish Michael would shave off that dirty mustache!"
Ben: "Just because you can grow facial hair, doesn't always mean you should."
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A Dirty Teen Mustache is a mustache that some teenagers thinks looks cool on them, but it doesn't. It's like the kid isn't meant to have a mustache, but he has one anyway. That's called a dirty teen mustache.
bawb: Hey, what's up with the mustache?
John: Oh, right, how's it look :D.
bawb: uh, no. Shave that Dirty Teen Mustache off.
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When a lady shaves her nether regions besides her lips
Guy 1: how’d your date with Stephanie go last night?
Guy 2: ehh, I was about to go down on her, but she had a dirty mustache and it turned me off