cognitive bulimia

the phenomenon of your mind immediately purging itself of something that it no longer has need of.

Curt: I was trying to help my 10 year old with his homework yesterday and I completely freaking forgot how to multiply fractions.
Rod: Yeah, I know what you mean, I had to take a Philosophy course in college, and the minute it was over....bang....cognitive bulimia....without even realizing it I forgot everything I spent a semester memorizing.

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