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The equivalent of an ambulance, but instead of sick people, a dumbulance carries dumb people away.
Dumbulance originates from the TV Series, Trailer Park Boys, in an episode in which half-witted Corey and Trevor are shot at, and when they plead for an ambulance, an angry Ricky retorts that they ought to instead be picked up by the dumbulance.
A: (Spills on herself)

B: Do you need a fucking bib or something? You're 16! I'm going to call the dumbulance on you!
by Maddox's Alphabet March 27, 2009
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