frostcock
The drawing of a penis on a car whose windows are frosted over. This event usually takes place after a winter night of drinking at a friends house, and upon leaving, drawing penises on neighbors frosty cars. the neighbors being none the wiser. It is ideal to use a knuckle rather than a finger as to not leave a fingerprint.
We were so drunk at Joe's house, when we left, we drew frostcocks all over his neighbors cars, unbeknownst to them...