A "Mattress muncher" is predominately male and of the same sex perswation, having said that its not totaly necessary as long as one male or female is face down munching a mattress with something hard entering a lubricated hole, it could be any hole as long as there is a mattress and a person face down in that mattress.
She was face down taking it hard from behind, she was "mattress muncher" or more commonly used, Elton john, what a "mattress munching" homosexual. Not to be used solely in a negative way but to explain a certain style, having said that its a good cuss, piss off you matress munching bell end, possibly from the Brighton area in the uk.
by Witmond April 14, 2013
Get the Mattress munchermug. 
When you take your piece/pipe under your blanket while you're on your bed, and you toke it. Gets hella thick hella fast
by The Dragon Lung January 11, 2009
Get the Mexican Mattressmug. by Tigrrlily November 21, 2006
Get the squat mattressmug. A squaddy mattress is a girl who's slept with more than 5 members of our lovely armed forces. General slag, scally and chav.
by ali November 30, 2004
Get the Squaddy mattressmug. On a Sunday morning, Blanche asks, "Hey are you going to call that guy you went home with last night." Rose responds, "No it was just blood on the mattress."
by blanche deveroe September 23, 2008
Get the blood on the mattressmug. This term refers to African Americans in urban areas who can quite frequently be seen driving around with mattresses tied to the roofs of their cars, due to the fact they move several times a year. This is a common sight around urban areas. Mattresses are often very poorly tied with inferior rope, and additional support is provided by a series of arms sticking out the windows holding the mattresses in place.
I was late for work this morning because there was a car full of Mattress Movers doing 45mph in the center lane.
by MMJ Mike August 28, 2019
Get the Mattress Moversmug.