They play me in the UK now, you know
Different then Em, why? Eff low, he stays high
My flow, goes deeper then they even realize
Spelled out to you in the past lines, I’m blowin’ minds

from Greatness & Co. – 6'7 Lyrics on Rap Genius

Meaning

UKnow = U Know = You Know
Em, why? Eff Low = M-Y F-low = My Flow

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