Crotchdusting
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.
Crotchduster
When you scratch your nuts and the lint from your balls lightly dusts whatever surface you scratched them over
Man I went to take a shit and my crotchduster covered the toilet
crotchdust
A revolting affliction in which the elderly leave mysterious particles on the toilet after using it. Causes range from years of soaking in their own filth instead of showering, or sandy vaginas.
Harry always had to wipe down and sanitize the toilet seat before taking a dump, as his 65 year old mother had a severe case of crotchdust.