Heart racin', racin' past Johnny because he's racist

from Kendrick Lamar (Ft. RZA) – Ronald Reagan Era Lyrics on Rap Genius

Meaning

a.k.a. the cops (Johnny Law), stereotyped as racist but also part of an inherently discriminatory criminal justice system

“It ain’t a secret, don’t conceal the fact: the penitentiary’s packed, and it’s filled with blacks.”

Additionally (continuing from the previous line), ecstasy is known to rapidly increases your heart rate, hence “Heart racin'”.

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