Son Of A Gun
Written by The Vaselines
Up, up, up and down
Turn, turn, turn around
Round, round, round about
And over again
Gun, gun, son-of-a-gun
You are the only one
Who makes any difference
What I say
The sun shines in the bedroom
When we play
The rain it always starts
When you go away
Archivist's note: Notice the difference between Kurt's lyrics and the original song.
From Wikipedia:
Son of a gun is an exclamation in American and British English. It can be used encouragingly or to compliment, as in "You son of a gun, you did it!"
[...] Encarta Dictionary defines the term in a different way as someone "affectionately or kindly regarded."
This is also a strongly gendered term, as suggested by the word "son". It is almost never used to refer to women, only men.