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The act of passing someone - typically in a crowded and noisy place, such as a bar or concert to avoid detection - and purposely touching/rubbing the front of one's pants to their person.
(at a concert)

Janet: Where's Phil?
Richard: He took off to mingle.
Janet: You mean he went crotch dusting.
Richard: Yeah.
by Mattydreads December 09, 2008
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2
The act of lining up and pressing the anus up with the opening of the vagina and passing gas. The Gas enters the vagina as a fart but exits as a quiff.
Guy 1 - "I got away with crotch dusting some broad last night.."
Guy 2 - "Diiiiiirty"
by nineninenine January 13, 2010
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3
When a man sits on a woman's vagina and farts.
Ann wasn't fond of Rick's attempt at crotchdusting her, but that didn't stop her from trying to queef on his cock.
by Cracker Mcgee October 11, 2009
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4
The act of lining up and pressing the anus up with the opening of the vagina and passing gas. The Gas enters the vagina as a fart but exits as a quiff.
Guy 1 - "I got away with crotch dusting some broad last night.."
Guy 2 - "Diiiiiirty"
by nineninenine January 12, 2010
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Get a Crotch Dusting mug for your mate Julia.