when someone criticizes you for something that they themselves do.
when someone has the audacity to reprimand you when they are much worse than you.
Tony: Dude, you were wrong for standing up Kesley the other night.
John: Yet you're engaged yet you're fucking two of your fiancee's best friends! That's rich, bro. Real fucking rich.
Noun - A new way of saying 'awesome, cool, rad, far-out, etc.'
John Doe: "Well that's rich. He kicked himself in the face."