The liquid that spills out from a heavily used mattress when compressed, it may contain liquids such as; semen, saliva, blood vaginal juices, and other bodily secresions
by Slang Bitch September 25, 2017

A really nice person. Someone who thinks kindness isn't enough and tries to pay your mortgage by selling their car.
by Triptow November 21, 2020

by P mole December 9, 2013

A femme Matt, binary. Gender specifically a female who is not as smart as she thinks she sounds. Sometimes with a proportioned head, which is rare among Matt’s. AKA Offensive.
That Mattress Staci is a real R in the morning especially when insufficiently caffeinated. She does have a huge following on that foot page on OnlyFans, there are a lot of Troy69s however. Not sure they all count.
by Karl Hungus March 29, 2023

When a girl/guy thinks their partner looks like Edward Norton, and during sexual intercourse wants her/his face to be dragged to the corner of the mattress, and then kicked in the back of the head for sexual euphoria. (Ala: American History X)
by Butt stuff November 20, 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

mattress gravy (n):
when you and a hooker fuck in the hooker's bed but make sure not to get it in her.
when you and a hooker fuck in the hooker's bed but make sure not to get it in her.
by Slang Bitch September 25, 2017
