noun. For an end-of-the-world scenario, this sounds fun. Beats the heck out of the Rapture and death-by-swirlie.
Real citation: "Fourth Horseman of the Tire-Swing-pocalypse?"
(Josh Marshall, Sept. 15, 2008, Talking Points Memo, http://www.talkingpointsmemo.com/archives/217165.php)
Made-up citation: "As a camp counselor for eight years, I was lucky enough to never encounter a tire-swing-pocalypse. Good thing too. Three tether-ball-geddons a summer kept me busy enough."