MYOB, from wiki QUOTE:
In the classic science fiction story …And Then There Were None, Eric Frank Russell shortened “Mind Your Own Business” to “MYOB” or “Myob!”, which was used as a form of civil disobedience on the planet of the libertarian Gands. Russell’s short story, …And Then There Were None, was subsequently incorporated into his 1962 novel The Great Explosion.[dubious – discuss]
BYOB, bring your own bottle, could be booze, could be anything really.
GYNOB, Woman comes home and finds note on fridge, Someone from the Gyno Colleges called. They said your Pabst Beer was okay. Since when do you drink beer, and why didn’t you share?
Yeah it’s an old joke, but I’m an old jokester.