a fiddle - A fiddle is a sneaky cheat, like a con man who steals your m

A fiddle is a sneaky cheat, like a con man who steals your money and laughs in your face.

I got conned by that fiddle at the market. Now I’ve got a goat and no cash.

That guy’s a fiddle. He sold me a bag of rocks and called it gold.

She’s a fiddle. She took my lunch money and said it was a loan.