Sissimon Share definition Flag A asian girl that resembles pikachu. Very pretty, but small enough to fit in a pokey-ball. Therefore looking like a pokemon. damnnnn that biiiatch is a sissimon....fasheezy ya heard. Sissimon by Melanie bitch. March 30, 2008 0 0 Get merch Get the Sissimon mug. Buy Now — $32.95 See more merch