Top Definition
When you ejaculate on the upper lip of someone who is asleep, then rip out their pubes while yelling "MORNING MUSTACHE" and sprinkle it upon the the gooey mixture and let it dry.
My girl wasn't keeping it trimmed up downstairs so I had to morning mustache her.

My girlfriend didn't give it up last night so I taught her a lesson by giving her a morning mustache.

I like kissing a man so I gave her a morning mustache.
by Red Raider Safety May 07, 2009

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