Whistling to the melody, couldn't think of a better D

from Kendrick Lamar – Rigamortus Lyrics on Rap Genius

Meaning

Kendrick’s response to your rap attacks is to simply whistle. Which is from your perspective, a Dick behavior.

Couldn’t “D” mean Defense, like “D” is referred to in sports? “Whistling to the melody couldn’t think of a better defense”

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