But don't come unless you come to battle, now mount up, jump in the saddle

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

Meaning

Eminem’s whole career is seemingly rooted in battle rapping: “Open Mic” on Infinite, his famous battle rap during 8 Mile, as well as numerous beefs with other artists — he’s also paired up with Red Bull to create an MC competition

To “jump in the saddle” is a figure of speech that means to get ready, based of course on horseriding (which you can also do in Call of Duty!)

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