FD=W the rule and the unit measurement for the product is called joules

from Jalib – Quest for Joulelry Lyrics on Rap Genius

Meaning

I think a new slang has been invented…the new word for money, power, respect…Joules. The product of work.

To help improve the meaning of these lyrics, visit “Quest for Joulelry” by Jalib Lyrics and leave a comment on the lyrics box