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A way to say you think someone is an idiot for even bringing up the topic. Like you’re annoyed and ready to throw something at them.
You: Nah man nah. You think I’m gonna go to that party? It’s gonna be 100 degrees and full of losers.
Bro: Nah man nah. You want me to believe that clown is actually your cousin? Please.
Girl: Nah man nah. You think I’m dumb enough to fall for that again? No way.