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Phrase used to describe the fact that it is easy for one to be knowledgable about an event after it has happened and the high has worn off.

IE: An individual has a realization about the event that should have been obvious all along, yet they didn't catch on because they were too high.

From the future, when the high wears off, we can look back and see what we could not see when we were in the past because we were too high.

Also allows one to learn from their mistakes.
After looking back on the situation, Mikey realized that ordering 20 unicorn onesies was a decision he made because he was very high.

Mikey: "Sarah, why did you let me order 20 unicorn onesies yesterday without even trying to stop me?”

Sarah: "Highsight is 4/20, Mikey, learn from your mistakes."
by Spitting Glitter January 31, 2018
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