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It means you aren't chimmy. Chimmy is a word that means various things depending upon the context, but it is always a good thing to be. So, If you are non-chimmy then you're trash. No good. Your life is not worth living.
Chimmy person: "You fucking normie, you non-chimmy bitch why don't you kill yourself"?

Non-chimmy person: "ur mum".
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