On my authority; according to me. An intentional misspelling of "says me." Used to assert one's confidence about some statement or proclamation one has just made, most often in response to the phrase "Sez who?" A: "You are not taking the car out tonight!" B: "Oh yeah? Sez who?" A: "Sez me! I paid for it, so I get to decide who uses it or not!" A: "Who says we can't go out tonight?" B: "Sez me, that's who! This is my house, and you'll do as I say!"