Top Definition
To deliberately use someone else's brain to solve a problem or answer a question, rather than your own, even though, with time and effort, you could solve the problem yourself.
I could've worked out the answer to Fermat's Last Theorem, but I brainjacked Brian instead.

Rather than look at the map on the wall to find her way, she brainjacked me.
by Novosapien October 19, 2009

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