Any who touch a mic prior's
Not even Austin Powers, how the fuck are they Mike Myers?

from Eminem – Almost Famous Lyrics on Rap Genius

Meaning

At a freestyle competition, anyone who rapped (on the microphone) before Eminem did not scare him (unlike Michael Meyers, the murderer from Halloween)

Heck, the other rappers weren’t even as scary as Austin Powers! (who is played by the other Mike Myers, aka the “murderer of funny” from The Love Guru)

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