And I'mma make sure murder be the case nigga
Cause I know you be singing songs, no Trey nigga

from Juelz Santana – Nobody's Safe Lyrics on Rap Genius

Meaning

Juelz knows that a lot of fake thugs will quickly talk to and cooperate with the feds. Because of that risk, he has to make sure you’re dead so you can’t talk.

He uses a play on words here with “sing songs” meaning talk to the cops, which is indicated by him saying “no Trey” because Trey Songz actually sings songs, musically.

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