She say "Why you dye your hair?", cause it's not alive
Get it, it has no life so it has to die
from Buddy (Ft. Pharrell) – As Far As They Know Lyrics on Rap Genius
Meaning
These two lines relate to the various colours that Pharrell has been dying his hair recently (which has raised a few eyebrows). He says that it has “no life” because his original hair colour is the same tone as his skin, thus making it not very visible
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