Dirty Oikawa Share definition Flag The act of fucking someone with the flattest ass ever. Guy1:”yeah his ass was so flat.” Guy2:”Damn they must be a Dirty Oikawa.” Dirty Oikawa by PurpleHairedDumbass December 22, 2020 0 0 Get merch Get the Dirty Oikawa mug. Buy Now — $32.95 See more merch