The carbon Audemar
That's a whole 'nother metal, but still keep it ghetto

from Pusha T (Ft. Tyler The Creator) – Trouble on My Mind Lyrics on Rap Genius

Audemar is an expensive brand of watches. Carbon is a metal* compound that is black. Therefore, black watch:

But even though he can afford such things, he still stays true to his roots.

*carbon is actually a nonmetal

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