Referencing the Jonas Brothers in a situation were someone has fallen for a ruse . Like if you where punked by Ashton Kutcher. Instead it would be at the hands of the Brothers themselves.
The Jonas Brothers play a prank on their costar Chelsea Staub, where she is dragged into a lie about a broken guitar. When it becomes clear that Chelsea is about to be forced to defend herself, the boys promptly announce that she has been Jo Bro'd!
When you are pranked by a Jonas Brother.
The audience got Jobro'd when the Jonas Brothers sprayed them all with white foam during the concert.