Top Definition
A native Aboriginal word from Australia tat literally means a nutty chatter or a person who talks a lot but has empty thoughts of what he/she is talking about.

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Someone who is forcing his/herself into a conversation even without knowing the issue or topic. It can also be someone who tries very hard to speak a language he/she doesn't know well thus causing the idea be rumbled and confusing the receiver.
Stop being a chatnut.

That chatnut caused the spreading of wrong information.

You're a very annoying chatnut.
by LAD.M March 09, 2008

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