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1.
A frosty window starts off with you doing a drunk chick from behind, while your buddy hides in the closet. Real quickly you and your friend switch places so that the girl doesn't notice, and you sneak outside to the window facing into the room. You then wipe away the frost on the window and wave and smile at the girl.
Yo, did you hear about Calvin pulling a frosty window on that chick? She was all like AH LAH LAH LAH LAH !
by Kenko May 04, 2006
 
2.
When you give a girl a facial while she's wearing glasses
Jen: I can't get this jizz off my glasses!
Sara: maybe you shouldn't have gotten frosty windows!!
by Ammo11m January 09, 2012