mixture of shit/cum after a good assfucking
Joe's mother caught on to his homosexuality the summer he was home from college and she noticed a shumstain on his briefs.

by david rauch January 6, 2006
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To shit and cum at the same time; a solo blumpkin, if you will.
Everybody run, Sammi's going to shum like crazy!
by Not A Facebook Friend August 28, 2011
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The byproduct produced when a male shits himself while having an orgasm.
We had to change the sheets on the bed because there was shum all over them.
by seapocket September 27, 2010
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Occurs when a man simultaneously shits and cums during ejaculation either alone or with a sexual partner.
When I have sex with her, it's so good that it makes me shum!
by Eric the Terrible January 21, 2010
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The act of shitting out cum explosively.
My girl was shumming all night. It was like an ass cannon.
by Hugh Gee Rection September 1, 2007
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Combination Shit and Cum

the brown liquid that falls from the arse after a cum filled arse fuck, usually a brown creamy liquid, sometimes filled with vegies or some sort of seed.
o yer, o yer, *splat* awww yuk babe look at all that Shum leaking from your arse
by AZDAWG231 September 2, 2009
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