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. A girl that sleeps around, whom "everyone" can sleep with.
Derived from a Norwegian military expression "felles madrass" .
Derived from a Norwegian military expression "felles madrass" .
That girl Megan is such a shared mattress, did you hear that she slept with 5 different guys at her last party?
by 18382 August 24, 2009
Get the shared mattressmug.