yarrismo Share definition Flag originated from the word "yarr" with more of a presant day twist. can be used very much like "yarr", or to break an awkward silence. "Holy Yarrismo" man 1: how are you today? man 2: yarrismo! yarrismo by Killer_Jeep August 2, 2003 0 0 Get merch Get the yarrismo mug. Buy Now — $32.95 See more merch