Top Definition
When class is so boring you zone out and don't remember anything the prof said or anything you did for the entire 1 hr 15min.
Mina: "Omg class was sooo boring today."
Leena: "I know, I zoned out and then I looked down and I had notes and I didn't remember taking them."
Mina: "Class blackout, nbd."
by LiveXAndXLearn November 21, 2011

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