I can see power steering
Sex drive when you swerve, I want that interference
It's coherent, I can hear it, mmhmm

from Kendrick Lamar (Ft. Drake) – Poetic Justice Lyrics on Rap Genius

Meaning

Power steering = troubles
Sex drive when she swerves = Horny girl when she drinks Interference = He wants to take care of the troubles

The girl is troubled and resorts to alcohol as a solution, but Kendrick believes he’s all she needs.It also could mean the way she rides the D, it’s like she’s power steering it. She “swerves” or i.e. she can ride a mean dick.

Her interfering signals, (moans), are clear, which brings us to the Wave theory: Coherence is a special property of waves, (in this case sound waves), which makes it possible for the waves to interfere in a unique way with each other. In the lyrics, he hears her coherent moaning sounds interfere, (he perceives them louder than a ordinary moan).

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