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To trip on acid or mushrooms.

Verb: Going "dumb" via shrooms or acid

Reference: The scene during the Walt Disney movie "Dumbo"... You know what I'm talking about.
Dude, you wanna go Dumbo?

YO Whitney, those guys at the Phish were going Dumbo!
by B-kizzle n' K-bizzle December 07, 2009
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