Got bitches on my jock out in East Detroit
Cause they think that I'm a mothafuckin' Beastie Boy
So I told em I was Mike D
They was like, "gee I don't know, he might be!"

from Eminem – Cum on Everybody Lyrics on Rap Genius

Meaning

Because Em is white and raps, he is often mistaken for one of the Beastie Boys, the most famous pre-Eminem white rappers

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