What did I do yesterday ? Above image is the rebus.
Src : slightly copied .
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Sign up to join this communityMaybe it means:
$$ \sqrt{\frac{-1}{64}} = \frac{\sqrt{-1}}{\sqrt{64}} = \frac{\sqrt{-1}}{8} = \frac{i}{8} = i~~over~~ate$$
You could see that the 8 on 2018 resembles myself who eats a lot...