by thatnoodlyappendage January 1, 2012

The best type of mattress hands down. Much superior to spring mattresses. Nothing can compare to a foam mattress when it comes to comfort. However when you buy a foam mattress you are also making the statement that sexy time isn't reserved in the bed anymore, this is more of a pro than a con really (vanilla sex = booorinng).
Jane and dane decided to get a foam mattress and did not regret it one bit. However it was impossible to fuck on it, so they did it on the floor instead.
by Mary Mary Quite The Contrarian May 7, 2021

nipples, which once pressed down, resurface and rise to average nipple height similar to memory foam
dude 1: "damn, yo bitch got sum sleep number lookin ass nips!"
dude 2: "yeah she has them mattress nips that rise, like yeast brother!"
dude 2: "yeah she has them mattress nips that rise, like yeast brother!"
by iusedtobeafish March 3, 2019

A scenario, often playful and sexual, in which a person forcefully stabs a knife into a mattress and uses it as a sex toy, sometimes as part of an act or roleplay, while their partner or praises them.
The term is heavily inspired by a scene in the Book "Lights out" by Navessa Allen in which a character proposes the idea of riding a knife in a mattress.
The term is heavily inspired by a scene in the Book "Lights out" by Navessa Allen in which a character proposes the idea of riding a knife in a mattress.
Eammon i want you to grab a knife and stab it into the mattress and watch me ride it as you praise me.
Knife in Mattress
Knife in Mattress
by Freaky Def August 10, 2025

by jSalty January 12, 2019

A slang for having intense sexual intercourse to a point where there are wet spots on the mattress and you need to flip it.
Mab: Where were you last night?
Funky: Oh we ended up flipping the mattress.
____________
Nassim: Hey girl, what's wrong?
Faeze: It's been so long that i got my mattress flipped 😫😩
Funky: Oh we ended up flipping the mattress.
____________
Nassim: Hey girl, what's wrong?
Faeze: It's been so long that i got my mattress flipped 😫😩
by FunkSpunk December 14, 2023

Damn that gal lays more guys than any other 'Slapper' when her plane touches down! a real 'Flying Mattress' that one!
by Jimmy de Bogan March 8, 2024
