The equivalent of "absolutely not." Can also be taken as "if you ask me again, I have permission to punch you in the cocksucker." If someone tells you "Nah, I'm good," there's no possibility of them being persuaded otherwise.
Friend 1 - "Hey dude, wanna go get a drink with me?"
Friend 2 - "Nah, I'm good."
Friend 1 - "Fair enough!"
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