(Brutus in that booth,
Earl is comparing himself to the famous assassin Brutus, who was head of the plot to kill Julius Caesar. Earl might also be referencing another famous political assassin, John Wilkes Booth By saying this, Earl is probably referring to how his rise to power in the rap game will come with him killing all the most powerful MCs with the stuff he spits in the Recording booth.
Earl also might have been referencing Junius Brutus Booth, the father of John Wilkes Booth, the famous assassin who murdered Abraham Lincoln (also in a booth-like setting.)
So Earl is not only saying that he’s killing off competition in the booth (take note of the wordplay,) but he’s also saying that he’s the father (Brutus Booth) of other rappers that are currently in the game claiming to kill shit in the booth (John Wilkes Booth.)
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