When you dont shower for a while and your crotch begins to take on an odor similar to that of yogurt.
Person 1: Woah, do you smell that?
Person 2: .....wot
Person 1: OMG, you've got yogurt crotch! Wash that!
crotch yogurt is the cum a guy blows in his whitie-tighties when he jacks off in them.
I jacked off in my Calvins and blew a load of crotch yogurt in them!
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