When someone says something that's supposed to be funny but really isn't, or alternatively when someone takes a joke a stage too far, and makes it un-funny. Someone else has to then announce it as a Russian Roulette Moment Some people's entire lives are like one huge Russian Roulette Moment, ie. everything they say is supposed to be funny but never is
Becky: "It's like Russian Roulette...who's gonna gan? Gan, gan!"
Daniel: "Excuse me everyone, can I please have a moment of your time? I just have a small announcement to make, I'm dying *serious face*
A very humiliating moment, where things feel like they are crashing, a low point. Rock bottom.
Used by Oprah to descibe her "most humilitating experience in my life", when shopping in Hermes for her friend Tina Turner she was turned away by the staff very rudely (as she said it). There are several variations to this story.