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 around like that."
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Having a wet dream while sleeping on your stomach
Geology Professor: "Oil drillers shoot silt at high speeds to split rocks underground to find and raise oil. This is called 'fracking.'"
Student (whispering): "Huh, I guess I did some mattress fracking last night."
A cottonwood girl willingly able to sleep around with every guy in town, usually in a guys best friends bed, and afterwards only asks for $5 and a cookie.
Skylar always loved using guys for sexual attention, but not just one guy his closest friends to, thus being a Mingus mattress.
Masturbation. Basically, if no one else is around, who are you going to beat it to but the mattress?
"John was beating the mattress so hard last night that I heard it through the wall."
"Jessica's out tonight. Guess it's me and the mattress."
A prostitute that works in the truck stop parking lots.
The mattress monkeys are out tonight.
A holiday on which most workers won't get a day off, but you'll probably be able to buy a mattress on the cheap.
Person 1: What even is the point of Flag Day, I still have to come into work.
Person 2: It's a mattress holiday.
Person 1: (checks newspaper) Huh, I guess these are some pretty good deals on memory foam.
A person who's having a high amount of sexual intercourse throughout their life. (mainly prostitutes, bitches and your girlfriend)
Hey, do you wanna hang out with Jessica again, your public mattress?
Friend 1: Where are you going to sleep tonight, man?
Friend 2: Er, I'll probably search for a public mattress and stay there until tomorrow.