Verb. Commonly used to describe the act of a female, with a large rack, swinging back and forth while knocking down everything around her and giving all the guys a black eye with the unique "nipple-punch" using her huge tits.
Cid: "Damn man, thats a sick black eye. Did you get into a fight?"
Cloud: "Ya... with Tifa's rack. She was sandbagging me the whole night."