jimitis Share definition Flag A mental disorder that causes a person to act half their age, explode with anger at random people, make bad jokes, and annoy other people Person 1: FUCK YOU ASSHOLE!!! Person 2: Dude, do you have jimitis or what? jimitis by coder68 August 29, 2009 0 0 Get merch Get the jimitis mug. Buy Now — $32.95 See more merch