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1.
diggin up a corpse, affixing your friends lips to any sphinkter, and stomping on the stomach to send a (not-so) fresh shot of bodily contents into their mouth.
mumphing is a favorite passtime of the saxon footballers
by hawk March 26, 2005
 
2.
Favourite past time of your more discerning necrophile involves cutting an incision into said body and doing the unmentionable to it
That mortician's a sick bastard he's always mumphing his patients
"Yeah some might call him a mumphmaster"
by Jono - Les Cimes November 06, 2003