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