Nah ah
A loud and dramatic way of saying you don’t believe something. Like when your friend tells you they saw a ghost and you just scream ‘Nah ah’ like you’re the ghost.
My friend said he saw a ghost. I said, ‘Nah ah, you’re just high.’
She told me she aced the test. I said, ‘Nah ah, you’re lying.’
He said he got a girlfriend. I said, ‘Nah ah, that’s just your ex.’