jack blacker
a person who plays blackjack and poker like it’s their job, even though they’re clearly terrible at it and their money is gone
He’s a jack blacker. He plays poker every night and still has no money.
My brother’s a jack blacker. He thinks he’s a pro at blackjack, but he’s just bad.
That jack blacker plays poker like it’s his life and he has no idea what he’s doing.