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When you suck dick on the weekend and pass your math test on Monday because of the massive protein boost
Guy: "shit fam 89%, that's crazy. Did you cheat"
Hoe: "nah fam got brain juice on Saturday at that rave"
by ignoreyourproblems November 21, 2016
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The juices inside your brain that help you think up words for urban dictionary
"omg I don't know any words, let me use my brain juices gurl"
by Paixx May 06, 2015
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The knowlage contained in someones brain that can be worked out of them like juice from an orange.
Thats a fantastic idea, why didn't I think of that! Bobby, I'm gonna steal some of your brain juice!
by Sam Magee May 25, 2008
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