To shit and cum at the same time. This usually occurs when the victim is listening to beautiful music or is overcome by intense feelings of pleasure and emotion. Another occurrence is when you're jerking off and taking a shit on the toilet at the same time.
I shummed myself at the pink floyd concert when the comfortably numb guitar solo started

I just took a nice shum in your toilet
by dillskin April 07, 2011
A Shum is a person who buys new versions of phones as soon as they come out and disregard their perfectly fine old versions of the phone.... Usually people in their late teens and 20's, who want to look "cool" by having the newest versions of phones)
That Shum Dave just spent $300.00 on the new Galaxy phone that came out yesterday, although his old Galaxy still works just fine.
by Ken-1802 December 15, 2013
Often occurs after unprotected anal. A mixture of shit and cum will seep from the back passgae, or, shum.
Last night I took her up the ass and when I pulled out she shummed all over the sheets.
by Lassie. March 05, 2010
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
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 02, 2009
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