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Something that only the smartest of people and the maddest of lads/laddies have; something you say in the occasion of someone doing something very amazing that requires a high amount of intelligence
Einstein: "I figured it out! e=mc^2!!! I did it! An amazing equation that will have countless applications!

Einstein's Wife: "BiG bRaInS"
by howiemandealt June 17, 2019
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Sarcastic reference to people especially politicians, journo's, pundits etc who profess to great wisdom and use college words to show how smart they and how dumb the rest of us are.
Listened to some big brained nibba on the TV last night explaining that boys are better at Physics cos they have willies and are used to handling the fluid dynamics of their urine. Tosser
by FashyKen October 05, 2017
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