Thats that 20/20 hindsight
People say that hindsight is 20/20, but Gambino is using hindsight as actual sight of the behind.
It’s a play on the phrase “hindsight is 20/20”, originally meaning that you know exactly what happened in the past, while you couldn’t have predicted those events before they happened, and can’t predict future events either — not to mention the fact that she was just looking at this girl’s ass…
see the line:
You lookin dumb as hell man for ever sleepin' on him
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