Top Definition
mum jump: an act in which a minimum of 2 people dig up a freshly dug grave, they find a corpse, preferably female, and 1 guy gets down in the hole and strips the body, and puts his face in her vag, then the guy up at the top of the grave jumps on the stomach of the body, causing festering organs to spew into the face of the first guy.
we went mum jumping last night
by thugaim September 18, 2013

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