Often involves pulling all 11 players in front of the ball, essentially daring the attacking team to send all 11 of theirs out.
Name is suggestive of putting a bus in front of the goal. One of several tactics referred to by football fans as "anti-football," and generally frowned upon by all but fans of the teams employing it.
Fan 2: "Well, you have to remember, mate, the Mackems like to park the bus."
Fan 1: "Oh yeah. No wonder Newcastle fans hate them so much."