Especially when Drop drop the beat
I drop jewels like my nuts dropped out of my briefs

from Kendrick Lamar – H.O.C. Lyrics on Rap Genius

Meaning

Jewels is a slang term for Testicles. So he’s saying he drops quality music (jewels) like his nuts (jewels) falling out of his briefs.

Also, Drop is the one who produced this song.

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