Ninjamation Share definition Flag The guestamation of a fuckin' Ninja. "That ninja has some badass ninjamation skills, he ninjamated the exact time that dude was gonna get punched in the face!" Ninjamation by ThatNinja January 2, 2011 0 0 Get merch Get the Ninjamation mug. Buy Now — $32.95 See more merch