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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
I just cleaned out my mattress gravy last night. it took my five hours
mattress gravy (n):
when you and a hooker fuck in the hooker's bed but make sure not to get it in her.
"Fuck man, I feel so ashamed. I just made some mattress gravy last night."