I believe it's like get crazy or go crazy that's why some people say it before parties. Like: "yeah dude I'm going to get crunk at this party".
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I thought it was just a way to say get drunk, without letting people know what your plans are. Mostly used by people under the legal drinking age lol. "a euphemism for getting really crazy and -blam!-ed up on marijuana and alcohol (stoned and drunk. Chronic plus Drunk = Crunk)."
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Well there you go haha makes sense I guess, I would never use it though...