Pronounced like "immunity", but with an "Oh." Military slang referring to the lighter penalties that officers usually recieve when compared to enlisted men.
Captain Williams got transferred, but didn't get relieved like First Sergeant Jones, thanks to his O-munity. They'll probably give him the bronze star to cover it all up.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi