xbfcb - ex boyfriend cock block.
When you are trying to get with a girl and a jealous ex boyfriend comes out of nowhere and cock blocks your game.
Dude 1: "Yo man, you get with that girl last night at the cocktail party?"
Dude 2: "No, she was in the fucking bedroom on the phone with her ex boyfriend all night who was threatening to kill himself... talk about a xbfcb"