Post facto meaning after the fact. And jacko shotr for jacking off or masturbating. Put together they from post fact jacko, right after jacking off, which is ejaculation or cum

When you accidentally spoil something for someone and then attempt to make it up by yelling out "Spoiler alert!"
It will nonetheless piss someone off because either a) you're just rubbing it in that you spoiled the ending to an amazing movie/book/show, or b) they weren't really paying attention before and would have missed the spoiler, but because you had called attention to it, now they are aware they have been spoiled.

When 2 Bro's get married for financial reason's, they enter into a Bro Facto Relationship.
It's an open relationship where the 2 married bro's usually enter into such an agreement as a means to afford rent and or a mortgage or to run a business with all the tax benefits regular married couples receive.

etym. "fex", turd + "post facto", after the fact An amendment adopted to neutralize a Bill or other policy that might be dangerously visionary or supportive.

people living together who are not married

"To the fact" in Latin. Just an official way of saying "facts". To affirm something."