says who v. phr.,
slang I don't believe or accept that.
■ An expression of rebuff often used to make fun of someone or oppose him.
"I am the strongest boy on the block." "Says you./"
"That brook is full of trout." "Says who? I never saw anybody catch trout there."
"You can't take Mary to the party
■ she's my girl." "Says who?" [TahlilGaran] English Idioms Dictionary ▲