"Yes" was the start of my last jam
from Public Enemy – Don't Believe the Hype Lyrics on Rap Genius
Meaning
A reference to PE’s previous single, “Rebel Without a Pause”. Its opening words:
Yes — the rhythm, the rebel
Without a pause — I’m lowering my level

In some countries (like the UK), “Bass” was the start of his last jam because Bring The Noise had been released in the interim. But we knew what he meant.
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