nah man nah
A super strong no, like you're mad and you're not even trying to be polite anymore.
You: Nah man nah. You think I’m gonna wear that shirt again? I’d rather be naked.
Bro: Nah man nah. You think I’m gonna go to that concert with you? I’d rather die.
Girl: Nah man nah. You think I’m gonna let you talk to me like that again? No way.