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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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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a mixture of shit and cum, created by a disturbed soul on twitter
"what would you do if someone jumped over you and shummed on top of your head"
by sojudreaming February 18, 2021
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The act in which a boyfriend or husband is under the impression that their significant other is pregnant with their child when in fact they are pregnant with some other man's child.
That bi@!#ch totally "shummed" him.
by Snoopdoggydex February 22, 2008
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Shitting and cumming at the same time; the double pleasure for guys
Mason: “Nicole I’m shumming shumming!”
by Gary8474662728 October 7, 2019
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