Set fire to the mic and ignite the crowd
You can see the sparks from hot metal
Cold-hearted from the day I Bogarted the game
Eminem is cold-hearted, but his raps are “hot” (slang for “good”; notice the hot/cold contrast) which is why he has “Bogarted” (i.e. stolen control of) the rap game.
* Humphrey Bogart was a widely known American actor; the American Film Institute ranked him the greatest male star in the history of American cinema.
“Set fire to the mic”…“Sparks from hot metal” = A literal illustration of setting a microphone on fire.
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