Don't be sly and try and put 'em on

from Lupe Fiasco (Ft. Jay Z) – Pressure Lyrics on Rap Genius

Meaning

Don’t try to do what Lupe and his crew do (rapping, drug dealing); you aren’t cut out for it.

The “sly” does two things here — it continues the “Sly and the Family Stone” reference, and it (slyly) gestures back at the “boxer” line, making you think of Sly Stallone in Rocky.

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