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When you go to the store and completely forgot what you were going to buy, so you buy things that you don't need at all or are completely different than the thing you needed to get.
Person 1: I'm going to the store
Person 2: Okay, get me Doritos
Person 1(Back home): I bought your Pringles!
Person 2: Hey idiot, I said Doritos, what do you have? Marketnesia?
by KRDunn00 June 07, 2018
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