I let him swim with like
Mad fishes

from Joey BADA$$ – DSL (Da Special List) Lyrics on Rap Genius

Meaning

He’ll leave them dead
http://www.urbandictionary.com/define.php?term=sleep%20with%20the%20fishes

It’s A play On The Word “FIN” Previously Used since fishes have fins.

A popular Mafia term is “Let Him Swim With The Fishes” because they were known to throw dead bodies in the water, sometimes tied to cinder blocks or bowling balls to keep them from trying to swim back up

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