Let me show you maintaining this shit ain't that hard, that hard

from Eminem – Rap God Lyrics on Rap Genius

Meaning

Many rappers have come and gone with 15 minutes in the spotlight, whereas Eminem has lasted as a force to be reckoned with in the rap game for over a decade. But while others find it a struggle to stay on top, Eminem does it effortlessly.

In relation to the last line, slapboxing is considered a very soft way of fighting (soft both in the sense of soft hits and pussy fighting). So the this shit ain’t that hard might refer to slap boxing as well as staying relevant in the game, making hard a triple entendre:

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