Used to descirbe something/someone epicly amazing... Like me! Do not use this on someone/something who is obviously not a triplekickassrainbow. Usually used to describe cookie monstercupcakes.
Pix: Kyra kyr, your a triplekickassrainbow!
Me: awww thanks Pix :D
or
This cupcake taste like a triplekickassrainbow!
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi