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
1 more 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