I recognize your fragrance (hol' up!)
You ain't never gotta say shit (uh!)

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

Meaning

When Kendrick’s girl comes up to him from behind, she doesn’t have to talk. He knows it’s her just from her aroma.

Notice the use of one of his notable phrases “Hol' up,” in a different context.

He also has the ability to pick out high class women based on simple surface observations such as her scent, touching on the studied fact that smell is our most evocative sense

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