The act of beating someone with Keystone Lights after they have committed a party foul. Keystones can be thrown or put into a sock in order to beat the party fouler but its standard that at least 10 Keystones are used to inflict sufficient damage.
Marcus: Holy crap! What happened to Jack?
James: He spilt his beer so we immediately Stoned him.
Marcus: What is stoning?
James: We beat him with Keystones.
Marcus: Oh that would explain the blood.