noun. Can be applied to any scandal--lipsticky or not--that makes you want to trepan your own melon with a corkscrew.
Related term: dingleberry-gate.
Real citation: "It seems that Specter has not given up the idea of a congressional inquiry into the New England Patriots’ alleged cheating, known as Spygate, or as I call it, why-the-heck-are-we-still-talking-about-this-gate."
(Sept. 11, 2008, Brain P. Nanos, Wicked Local, http://www.wickedlocal.com/scituate/news/lifestyle/columnists/x348019831/NANOSPHERE-Like-it-or-not-what-s-done-is-done)
Made-up citation: "Up next: Tom Brokaw weighs in on why-the-heck-are-we-still-talking-about-this-gate. But now, the secret history between Sarah Palin and caribou that Dick Cheney doesn't want you to think about!"