The act of hanging out the passenger side of a car, with a bat, and hitting roadside mailboxes while another person is driving.
1. "We played mailbox baseball last night, we broke the shit out of a bunch of mailboxes."
2. "This road had a lot of mailboxes on it, it would be great for mailbox baseball"
2. "This road had a lot of mailboxes on it, it would be great for mailbox baseball"
by The Dark Avenger April 15, 2003
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