AK-47 heavy metal
Who say Dre ain't ghetto? Just whistle like a tea kettle

from Dr. Dre (Ft. Hittman) – Light Speed Lyrics on Rap Genius

Meaning

Whistling, here, is the sound of bullets flying past—not quite the same as making a spot of tea, but such is the life of Dr. Dre.

Could also be a reference to the whistles people use to warn others that there’s police in the area

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