When 2 people commit the act of digging up a deceased female body. One of the persons involved places their mouth over the lower region (vagina) of the corpse whilst the other jumps on its stomache. Therefor causing the insides of the corps to exit the body and enter the first persons mouth.
Me and my friend went up the graveyard today to do some mungin.
by All knowing knowledge man November 18, 2011
Aussie slang: To eat something
'What are you doing?', 'Just mungin' on some bread'
by Aussie Slang Pro April 13, 2012