A fictional method of male ejaculation whereby one's semen is shot into the air as one main globule only to cluster and split into thousands of spunky droplets when the apex of it's trajectory is reached.
Dude 1: "Yo dude, I totally cluster spunked ya mom last night."
Dude 2: "Oh snap, Dude. Oh snap."
Dude 1: "That bitch was caked, yo!"