Referring to a lady's breasts which are utterly saggy. These breasts will normally face directly downwards and resemble empty plastic bags. They are most commonly found on old women and pictures of African tribes women who have never heard of a bra and have breast fed 58 infants.
Dave: That bird you pulled last night had nice tits.
Sam: Whatever dude, when I got her bra off they fucking hit the ground. She totally had a pair of sweepers. They were like skin flaps. Seen better tits on the birds in the Amdipmamam tribe.
High school english teacher whose monotone voice often lulls one to sleep in each and every class.
I fell asleep and totally drooled during Sweepers class today.