1. A girl who is too ugly, or large to be referred to as a slam piece.
2. One step down from slam piece on the ladder of objectifying girls. One step above a grundle troll.
Bro 1: "Did you see that slam piece that Derek hooked up with the other night?" "
Bro 2: "That wasn't a slam piece. That was a slam wagon. Imported from Detroit."
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