Top Definition
Somebody who smokes so much Marijuana that they begin to speak in a high-pitched voice, seemingly saying nothing at all.
Brian: Hey Drew, how are you man?

Drew: I'm just, oh man, I'm so smashed...

Brian: Drew, you've gone all Bongachu man.
by Captain Shitty Pants February 26, 2009
8 Words related to Bongachu

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