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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Im shumming!”

“Im about to Shum!”
by greek dictionary January 18, 2021
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Banks seriously!?! You shummed on the carpet, again? You can’t just leave your shit and cum everywhere.
by ShumMaster August 13, 2021
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You can say "shum" after a person coughs to acknowledge that you are not bothered by the cough, and that you hope they are okay

It is pronounced: sh-UM

It is inspired by the calming "uhm" sound that is soothing to others when they are coughing
John: *coughs*
Henry: Shum to acknowledge John's cough
by rootone March 17, 2022
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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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