tossing the cage
A fit of extreme laughter in which one's face goes red and one's vocal cords freeze up. The term "tossing the cage" refers to the spasms of the diaphragm and ribcage that occur during extreme laughter.
Man 1: Yo, that mans deadass tossing the cage right now?!
Man 2: It wasn't even that funny!
Man 2: It wasn't even that funny!