to act stupid , wild , crazy. Basically going insane usually during dancing (crump dancing) in a positive way !!!
Misha: Go Zane, go Zane! Yo he's is killin' it right now!

Mika: Fa sho, he dummin' it with them moves.
by Lil Lori June 9, 2006
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to be messed up as hell on weed or alchohal
This gangsta is dummin
by ssanchez January 30, 2007
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Noun- An insult used by individuals of severely underdeveloped intellect to make oneself feel adequate.
Person 1: What are you, Dummin?

Person 2: What does that even mean?
Person 1: I’m not sure, I couldn’t make it passed the fifth grade.
by IJ1987 January 26, 2022
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