When a friend says they are going to do something, (usually crazy and as a joke) saying bitchcard means they must do that thing in the next 24 hours or they get bitch slapped. Does not work for if statements such as " if that happens, I'll do this"
Jim: George W. Bush is the bestPresident the USA has ever had. He's a great public speaker too.
Bob: Jim, you are such a benchtard it astonishes me.
Jim: What did I say?
Bob: Exactly.