Ah. I get it now. You male sexist animal, you! You mean to say "gitter" as in "git 'er!" And "six-shooter" as in "shoot-'er!"
Where do you think the words "hunter," "stalker," and "killer" came from? A man, that's who!
< /sarcasm >
(Okay, I'm even scaring myself now.)
The term originated when men, in the 19th century, decided it was more fun to hangout with friends at the pub after work than go home and massage their respective wive's feet.