When you take a shit in the toilet tank instead of the toilet bowl.
Guy 1: Dude I just took a Double Decker!
Guy 2: Aw no way man, right in the hotel bathroom! Right on!
A mental kid who is on the floor sitting upright and his legs outwards and sliding his hands and legs in sink and making the noise zhew zhew zhew!
Will is being mental saying zhew zhew zhew on the floor!