Comes from a game, "Snog Marry Avoid" (Snog = British slang, Kiss or Make Out With.) The derivative, and more direct, "Fuck, Marry, Kill" is what this is referring to; is this someone you'd a) have a one-night stand with, b) want to make a long term commitment to, or c) just as soon murder to get them out of your life.
I'd personally want to add the option "Ignore" to the game!
Comes from a game, "Snog Marry Avoid" (Snog = British slang, Kiss or Make Out With.) The derivative