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
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
A dude that keeps himself lookin nice, almost with a pretty style, but when things pop off, he can get it poppin thug style as well!
JaRell came into the club lookin fly, but was kicked out after beating that guy for talking shit. He's a dumbout
by BrandonB UCantBMe September 20, 2007