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1.
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!
Beküldő: Eric the Terrible 2010. január 20.
 
2.
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.
Beküldő: Shummer 2012. január 22.
 
3.
The act of shitting out cum explosively.
My girl was shumming all night. It was like an ass cannon.
Beküldő: Hugh Gee Rection 2007. szeptember 1.