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When you get stoned to the point where you're glued to the couch, and can't can't make any truly meaningful contributions to conversation; the term "dumb" refers to both the person's current level of retardation as well as their relative inability to speak.
"Yo I'm bout to go get dumbclapped and watch Rick and Morty"

"That's the only way to do it my dude"
by johntom63 October 23, 2017
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