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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
Shum by dillskin April 25, 2011
When a male ejaculates into another person’s anus, and the receiver goes to the toilet & out comes the shum. The mix of the sperm & poo isn’t ‘cum’, it’s ‘Shum’. Shit and cum.
‘Oh wow! I just been to the loo after he fucked me in the arse, and SO much shum poured out!’
Shum by Natalienoonah January 13, 2020

shum bucket 

when you poo, pee and cum all in one bottle and then proceed to drink and/or throw it
Jessica gave me a shum bucket yesterday!
shum bucket by pigbussy December 18, 2020

Shum Bug 

“This ain’t even my weed i’m rolling. Shum Bug”
Shum Bug by Silas Asling August 20, 2021
Hello Mr. Shum, how can I be of service today?
Shum by JennyChan March 12, 2008

shum humping vooch 

bangin' the deuce till it looks like a tired dog's mouth
Being called a shum humping vooch was the greatest compliment Burnsy ever received.
shum humping vooch by berto LaV October 11, 2006