What's grinding, the cats that were trapped
In the mine when the mine cap sized over top of them
And cats couldn't find them
Little kids asking the firemen if dad was alive
In the tragic environment that dad had a task to provide them with

from Wax – I Ain't a Real Man Lyrics on Rap Genius

Meaning

Real grinding means doing dangerous work to provide for your family, not sitting in a studio recording.

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