a Grandiose one
A Grandiose is someone who thinks they're way better than they actually are. It's not a compliment. It's a middle finger to their dumbass attitude.
He said he'd be the best. I said, 'You're a Grandiose N****r.'
She talked like she knew everything. I called her a Grandiose.
He acted like he was the king. I told him, 'You're a Grandiose.'