Verb: the act of watching a particular series (usually but not always anime) of episodes or movies in a row.
(especially the ENTIRE series at once)
Noun: the series to be watched.
Originated from Eau Claire, Wisconsin. It was created as a more polite/useable form of mindfuck (which means the same thing) by the local university's anime organization. Apparently watching many hours of anime episodes straight does something to you in the head.
Verb: Remember when we brainspiked Eva last month?
Noun: The brainspike starts at 6 and ends four days later.