Good Fight, Sir. Share definition Flag Something you say to an epic fail. You say it when something so fail happens to a person. "Dude, I just got a virus!" "How?" "Limewire." "Good fight, sir." Good Fight, Sir. by Zipadedoobop May 17, 2010 0 0 Get merch Get the Good Fight, Sir. mug. Buy Now — $32.95 See more merch