Dunsies Share definition Flag (Pronounced 'dun zees') is Southside San Jose slang word for the conclusion of something. (Syn.) done, finished, completed, or doomed. "If I can't get there on time, I'm dunsies at work." Or, "That chick and I are dunsies." Dunsies by 408 January 10, 2008 0 0 Get merch Get the Dunsies mug. Buy Now — $32.95 See more merch