And when you forget it, that's when she pop up

from Drake (Ft. The Weeknd) – The Ride Lyrics on Rap Genius

Meaning

Talking about when you forget about a sexy girl, and you end up seeing her and she looks better than before, leaving your attempts to part ways to no avail.

Or perhaps a girl that will come back into your life just when you stop thinking about her and forget about her.

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