To go crazy on something or someone
Man if that hater dont quit runnin his mouth I'm bout to dumb out on him
by Tha Silencer March 02, 2008
Can you define these popular missing words?
To get in the "zone," to be at the top of one's game
Watch Chris Henry of the Bengals dumb out as they get closer to the red zone.
by Cory Battin December 19, 2006