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
Top Definition
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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