nah son
A no so strong it could knock someone out, with hand flaps, eye rolls, and a tone that says you’re done with this nonsense.
Nah son, I’m not going to that concert. You’re gonna make me late again.
Nah son, I’m not helping you with that. You’ve got to be kidding me.
Nah son, I’m not eating that. That’s not food, that’s a disaster.