son of a gun
A bad person; a person not liked.
I don't like Charley; keep that son of a gun out of here.
Julie's ex-husband was such a mean son of a gun, it's no wonder she divorced him.
A mischievous rascal; a lively guy. Often used in a joking way.
The farmer said he would catch the son of a gun who let the cows out of the barn.
Hello Bill, you old son of a gun!
The test today was a son of a gun.
Son of a gun! I lost my car keys.
Something troublesome; a hard job. Used as an exclamation, usually to show surprise or disappointment.
My car broke down, and I can't figure out how to fix the son of a gun!