Nah, bro slang
This phrase is an evolving term often found in young people.
A way of rejecting an invitation, an idea, or a suggestion
You challenge me to go into the haunted house by myself? - Nah, bro!
Homie 1: You wanna get some wine? Homie 2: Nah, bro. It's enough.
I've already said "no" and you still don't understand.
Someone who is totally bad at doing something.
Mary really can't sing for toffee.