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 7, 2011
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The profound sense of shame that accompanies an ejaculation during intercourse with a partner whom the ejaculater knows he or she does not respect or wish to be involved with for a long time, despite said partner's false perception that the relationship extends beyond intercourse; to cum with shame.
She was so shallow, vain, and dumb, but so busty that I couldn't help but let myself shum into her foul mouth.

I shummed on her tits.

I spent all night shumming on her stupid ass.

I shot my shum on those pearly whites; that shumming last night drained my balls and filled my conscience with shame - gave me a set of shamesticles.
by cagedfromspace March 21, 2017
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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!’
by Natalienoonah January 13, 2020
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Hello Mr. Shum, how can I be of service today?
by JennyChan March 12, 2008
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Verb- When shum is actually leaving your body.

When describing the action of shum being deposited (with the help of gravity) on a surface lower than the orifices of origin.
Oooh, this wild sex with you is so good...oh god...BABY I'M SHUMMING!!

I accidently opened the door and saw him shumming all over the place!
by Eric the Terrible January 21, 2010
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the shit and cum mix and run out of the girls asshole, thus the name shum
i sure love the smile on my gurls face when she feels the shum come flowing from her asshole!!
by coolrelax69 March 17, 2005
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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 5, 2010
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