Stinky'd means, that you just got EpIcAlLy TrOlLeD by Mario. In Super Mario 64, Mario says "Hey stinky!" And since then, it has been a meme where you would say "Hey stinky!" to someone that is taking a shit.
*Mario says hey stinky* "You just got hey stinky'd!"
After nice anal sex, one cums in girl's ass and then puts his face under her ass and lets the cum leak onto his face. And ofcourse it stinks pretty bad.
Back in 2000...
Doug: Hey Stef after i cum in your ass, let me stick my face under it.
Stef: What the fuck?
Doug: It's stinky leak.
Stef: Doesn't that stink bad?
Doug: AAAAAHHH YEP!!!!
Stef: Oh Luda, I love You.