Albert Barnes Commentary Jeremiah 51:14

"Jehovah of hosts hath sworn by himself, [saying], Surely I will fill thee with men, as with the canker-worm; and they shall lift up a shout against thee." — Jeremiah 51:14 (ASV)

Rather, Surely I have filled you with men as with locusts, and they shall sing over you the vintage-song. The vintage-shout suggests the idea of trampling Babylon under foot, as the vintagers trample the grapes; a metaphor of the divine wrath.