Dancing with the devil's wife
Doing something dangerous. Often used as a warning.
Guy A: I'm going to flirt with that girl.
Guy B: You know she's going out with the captain of the football team, right?
Guy A: Yup.
Guy B: You're dancing with the devil's wife.
Guy B: You know she's going out with the captain of the football team, right?
Guy A: Yup.
Guy B: You're dancing with the devil's wife.