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1.
Another name for the rhythm method of birth control.

Called so because it is the only form of contraception endorsed by the Catholic Church.
Well, the Pope says condoms are out, and the pill is born of the fires of Hell. So get out the calendar, baby, it's time for Vatican roulette.
av DrCyclops 30 oktober 2007
 
2.
Unprotected sex in which the male pulls out prior to ejaculation. Also known as the pull and pray method. Of dubious effectiveness in comparison to condoms or birth control.
I didn't have any jimmy caps so I had to resort to some Vatican roulette with Sarah last night at the party. Let's hope I didn't knock her up.
av Scotty007 10 december 2006
 
3.
offering your son up to be an altar boy.
Timmy can only play football if he goes to a catholic school, i think i am playing vatican roulette by wanting him to be a tight end.
av mcfoe1 29 oktober 2010
 
4.
A pejorative term used to refer to an outmoded form of natural contraception known as the Rhythm Method. Often used mistakenly to refer to coitus interruptus (the 'pull-out method'). The Rhythm Method officially fell out of favor with "The Vatican" in the early 1980's with advances in the study of the female reproductive cycle.

Current methods of Natural Family Planning (non-chemical and non-barrier contraception), when used correctly and consistently, have been shown in several peer-reviewed studies to be over 99% effective. This is similar to the efficacy of 'the pill.'

It should be noted that the use of such a term often indicates it's user has a bigoted and intolerant attitude against people who practice a religion they do not agree with.
By following the Creighton method or the Billings Ovulation method, faithful Catholics no longer have to play so-called "Vatican Roulette"

They have six kids? They must be playing Vatican Roulette.
av JMJ_are_so_ross 11 september 2010
 
5.
Sex without contraception.
Charles was very stressed: he had had some vatican roulette with his new maid and now he was worried she might be up the duff.
av Dunky Oggins 6 januari 2004