Prov. A humorous way of saying, "Everything belongs to me."; (A jocular variant of "What's yours is mine, and what's mine is yours," an expression of generosity.) I know you won't mind lending me your radio. After all, what's yours is mine, and what's mine is mine. The thief took his confederate's share of the money they had stolen, saying, "What's yours is mine, and what's mine is mine."