So you'd better trade your fucking mics in for some tool-box-es

from Eminem (Ft. Liz Rodrigues) – Survival Lyrics on Rap Genius

Meaning

Geniuses considered as such in their respective fields are often prone to mastering that field and none other. (Einstein excelling at sciences and failing at all other subjects…). It is a known condition amongst specialising type brains.

Given that, Eminem honed his rapping skills up to a point where competitors who didn’t have their lives solely focused on rap can’t ever dare to approach. He then advises them to trade their rapping career (mics) for another line of work or craft (tool boxes).

The toolboxes metaphor also sets up for the wordplay in the next bar.

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