Oldboy from the Park Chan-Wook film of the same name. Vicious from Cowboy Bebop. Oldboy used as an adjective... like Oldboy is such a vicious movie, that when someone asks "How vicious?" You could answer "Oldboy vicious" My friends and I used to make up random scales of measurement. On a scale from one to "Ichi the Killer" in viciousness, I'm Oldboy vicious, lol.