Joan is such a pendulimic person, she was extremely happy when she heard about the class that was not going to take place and then got depressed, because she had nothing else to do at that time
Large (pendulous) breasts swinging from side to side (like a pendulum) under a loose fitting shirt giving the appearance of two kids fighting under a blanket.
An action not unlike a Newton's cradle where balls of a similar size crash into each other and bounce back.
Saw that Frenchie on Big Brother and her huge tits were pendulating under her t-shirt.