RO Share definition Flag Racial Oppression. Unfair treatment of a specific ethnic group. See the Holocaust. Airport officer: (Looks at Indo's passport) I'm going to have to ask you to step aside sir. Indo: FUCK! That's RO, asshole! RO by AnIndo April 11, 2008 0 0 Get merch Get the RO mug. Buy Now — $32.95 See more merch