... material What is whoopee cushion, how to make it so funny?a whoopee cushion, also known as a poo-poo cushion and Razzberry Cushion ... for air to enter and leave the cushion.To use it, one must first inflate it with air, then place it on a chair or ... . If placed on a chair, an unsuspecting victim will sit on the whoopee cushion, forcing the air out of the opening, which causes the flap to vibrate and ...