Not For Nothin' Edit Meaning

1.

Common big houseor camppreface to a piece of advice or a warning. Its use is supposed to imply the speaker is neither bossing around nor threatening the hearer, only offering sage advice or a pithy observation. In practice, however, it is often used immediately before a verbal threat to another inmate.

Not for nothin', but your cellieis a straight-uprat. I saw him talkin' to the 5-Oright after that bust upwhere they lugged those dudes to solitary.

See nothin' for nothin', not for nothing, say, yo