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The condition in which a class or lecture is so undeniably filled with bullshit that one's brain turns off all function. This condition can cause a frustrating and confusing gap in the memory of the affected subject's for the period in which the class or lecture was attended and leaves one stupefied and belligerent.
"Dude, what did I miss in class yesterday?"

"I'm not sure, it was so boring that I had an academic blackout and I can't remember anything"
by Laxman33 November 09, 2011
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