I'm busting off in the ocean like a harpoon

from Flatbush Zombies – Face-Off (L.S.Darko) (Prod. By Erick Arc Elliott) Lyrics 1 on Rap Genius

Meaning

Double entrede:

His fame is blowing up (busting off).
He is busting his harpoon (dick) off in the ocean (Wet pussy)

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