The act of a ejaculating at the precise moment when a man initiates his bowel movement. This is a very difficult task and should be attempted with great caution.
Dan: Hey dude, is it possible to have an orgasm while pooping?
Joe: I don't know, go try.
Dan: Would that be considered shumming?
Joe: Yes.
by Shummer January 23, 2012
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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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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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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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- "you can put it over there if you wish"
the spoon said to the sloth "shum shum shum", when discribing what to do with their friend.
by slothy fork March 31, 2009
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To simultaneously defecate (shit) and ejaculate (cum) out of either pleasure or sheer anger, and in extreme cases, fear.

Can also be used as a verb; “shumming
Oh fuck. My mom found the shum bucket.

Oh fuck. I’m shumming.
by LilPeePeeAssociates January 4, 2021
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A really sexy cute guy who is the most elite in every thing he dose both physically and mentally. They are extremely rare to find with only a billion at any time appearing. They are also be very nerdy with a dark witty sense of humour. When you have found a shum shum never let them go because if you treat them well they will be with you for life.
I think he might be shum shum !!! So amazing !!!
by TruthWizard2543 February 9, 2020
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