son of a gun
US /sʌn əv ə ɡʌn/
UK /sʌn əv ə ɡʌn/

1.
真是没想到, 哎呀
an exclamation of surprise, admiration, or annoyance
:
•
Well, son of a gun, I never thought I'd see you here!
哎呀,真是没想到,我从没想过会在这里见到你!
•
He actually won the lottery, son of a gun!
他竟然中彩票了,真是没想到!
2.
淘气鬼, 家伙
a mischievous or troublesome person, often used affectionately
:
•
That little son of a gun hid my keys again!
那个小淘气鬼又把我的钥匙藏起来了!
•
He's a clever son of a gun, always finding a way to get what he wants.
他是个聪明的家伙,总能找到办法得到他想要的东西。