The act of throwing snowballs at cars. The term was coined by Michael DeRobertis of Scarsdale, New York, in the early 1980s. The word comes from the sound made when a snowball is thrown at a car, moving or parked. The term stems from the sound created when a snowball makes a direct hit with one of these "drum-like", hollow panels - "BOSH!!!"
Let's go Boshing - Throwing hard showballs, or iceballs and hitting the "drum-like", quarter panels of cars. "Bosh!!!!"