A female asshole.
"Dude, why doesn't Lisa give me back my dress?"
"You already know she's an Ice Crotch. I don't know why you gave it to her."
A woman with a vagina that has an icy exterior. This ice renders her crotch impenetrable. This woman will take it upon herself to keep global warming at bay by never allowing her frozen solid hymen to be quivered.
Damn, why is it cold in here? Oh, no, wait, Nicole's legs are open. Fucking ice crotch.