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To absolutely confuse or surprise someone, deliberately or otherwise, the the point of speechless amazement.
This happens often during such times as: Watching a far more skilled person than yourself perform an act, talking to a greatly profound, or possibly idiotic person, or most often, after a really, really good magic trick.
While watching that David Blaine special on TV, I got brain hacked, like, 20 times. How does he do that!?
by f1g_n3wton September 10, 2009
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