Top Definition
to make the most god awfull smell humanly possible
dad:argh whats that awful smell
son:thats mum shit dad
by b1nn7 August 25, 2006

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Little kids that hang out on streets and hurl abuse at passers by.
So called cus the parents just shit them out with no real emotion.
Shut up you mumshit's
by Psymonj May 20, 2004

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