A WHIZhouse is where most of the drug wizards are. In the sixties and mid-seventies it was the place you would call if some one was over-dosing or on a bad trip. Usually used in a SHOCK and AWE sense.
WHizhouse also means do everything, know-everything.
Hey man, you better call the Whizhouse and get one of those whizards out here quick. Your buddy is on a bad trip.