An expression used when you hear a fact relating something that sounds absolutely unbelievable.
"Scientists have developed a watermelon that tastes of vanilla!"

"Yeah? Says who?"
by Ben Rockitt May 10, 2004
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An expression used to challenge the truth of a speaker's assertion when the speaker has provided no supporting evidence or reasoning and has thus left only his own questionable authority as the basis for acceptance.
Math Teacher: History is a useless subject.
History Teacher: Oh, really? Says who?
by Mesai January 3, 2021
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a group of amazing knights who protect, defend, and say all that is Ni. As seen in "Monty Python and the Holy Grail".
by DonJose January 28, 2009
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A loser who watches all around too much Southpark, and stupidly quotes it.
anyone who says "uber" needs to ston i can't stand them.
by triplexxxsweet April 6, 2009
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They are knights. They say "kni". They are afraid of the word "it". Dont Say it to them, O, I said it, opps there it is again DARNIT! CRAP IT! Oh Forget it. Dang!!!
We are The Knights Who Say Hut'n'Nan. And We Pray for you to cut this tree down with....................... A HEARING!!!!!!!!!!!!!
by .. November 5, 2003
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