1. (noun) A girl who has sex so often, whether with the same partner (nympho), or many different ones(slut), that her back seems to be constantly on a mattress.
2. a condition derived by a girl who engages in said activities.
1. "That girl is a mattress back if I ever saw one."
2. "You're gonna get mattress back if you keep sleeping aroundlike that."
"Dammit bro that nickel lay mattress back stole 200 bucks out my wallet before she caught her uber ride."
By Larina
With A Mattress In The Back
a way to spice up any sentence in a way that even "your mom", "that's what she said", or "in your granny's oven" can not achieve; from the hit movie edward scissorhands.