I'm your worst nightmare squared
That's double for niggas who ain't mathematically aware

from Common (Ft. Canibus) – Making a Name for Ourselves Lyrics on Rap Genius

Meaning

Mathematical wordplay that has confused many. Do Common and Canibus really think that doubling a number is the same as squaring it?

While it’s possible that neither rapper understands basic arithmetic, they more likely mean that their lyrical threat goes double for (i.e. especially applies to) rappers not up on their math. The usage of the mathematical terms squared and double is just wordplay and not to be taken literally.

To help improve the meaning of these lyrics, visit “Making a Name for Ourselves” by Common (Ft. Canibus) Lyrics and leave a comment on the lyrics box