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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Secret society some say is more powerful than the Illumanati. Rumor has it their reach extends even to the African continent, where they use the sport of basketball to indoctrinate the locals.
Because Bill Gates was not rich and powerful enough to receive an invite into the Knights Who Say Pfftt, he settled on Bohemian Club membership.
by Mr. Pfftt April 9, 2004
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