If a woman is very skinny and /or has no ass, she can cause 'lint balls' by causing a man to drag his testicles across the bed sheet while he copulates with her, thus picking up lint.
Used to describe a slender or thin woman, or one with no curves.
A chick with no ass.
"No way," Fred replied, "She's too scrawny, I might get lint balls. I need a girl with some booty!"