My mama told me
Be careful who you do cause karma comes back around

from Usher – Caught Up Lyrics on Rap Genius

Meaning

Momma knows…

What goes around, comes around.
Because Karma’s a BITCH!

It is also a mixture of both proverbs.

A very similar line, of course, appears in Michael Jackson’s “Billie Jean.” This adds a double meaning to the next line, “Same old song,” because it’s literally from an old (1982) song!

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