sez who

sez who

On whose authority? According to whom? An intentional misspelling of "Says who?" Used to express disagreement with or defiance against something that someone has just said. A: "There's no way you can win the race!" B: "Oh yeah? Sez who?" A: "You can't take those files to the police!" B: "Oh, really? Sez who—you?"
See also: sez, who

Sez who?

verb
See also: Sez