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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Masturbating while taking a shit.

Comes from the words shit and cum mixed together.
Hey bro where are you going?”
“I'm going to the bathroom to take a shum.”
by Bobismybro232 August 16, 2020
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