I'm trying to grow it back again
It was an accident
I had my back against the fan
And chopped it off in Amsterdam

from Funkmaster Flex (Ft. Big Kap, Dr. Dre & Eminem) – If I Get Locked Up Lyrics on Rap Genius

Em explains his missing hair away by saying he was in the Dutch city of Amsterdam (presumably getting stoned, as weed is famously legal there) and got too high and nearly got his head chopped off by a fanblade (Em also mentions decapitation by fan blade again later in the song…)

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