A fork of Rural Dictionary
A meatball is a girl that goes the the gym and is serious about gaining muscle mass. She tries hard but is seen to other gym bunnies as a meathead. But girls can't be meatheads unless they take steroids. This, the term "meatball".
Sarah Is addicted to working out. She goes to the gym everyday. She works out with the guys. She is literally obsessed with working out. Therefore she is a meatball