son of a gun

US /sʌn əv ə ɡʌn/
UK /sʌn əv ə ɡʌn/
"son of a gun" picture
1.

an exclamation of surprise, admiration, or annoyance

:
Well, son of a gun, I never thought I'd see you here!
He actually won the lottery, son of a gun!
2.

a mischievous or troublesome person, often used affectionately

:
That little son of a gun hid my keys again!
He's a clever son of a gun, always finding a way to get what he wants.