Kids used to say she looks like a wrong answer
That someone tried to erase
But couldn’t quite get the job done

from Shane Koyczan – To This Day on Rap Genius

Meaning

To thoroughly erase something one must go backwards and forwards over the area needed to be erased, else you get smudges.

The children are saying her face is smudged between skin tones — much like the result of a messy erasing job.

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