gusher cap

A futile attempt to block a torrential flow of anything- such as the BP oil gusher. It just keeps flowing out no matter what you do.

Guy at party #1 "Man that guy just will not shut up about all his supposed sexual exploits, big investment dividends, rich friends, blah blah blah... I bought him a beer and tried to change the subject but he just keeps going."
Guy #2 "You bought him a beer? Nice gusher cap, dude!"