And if I catch you set trippin' with my cassette sittin' then it's on rappers

from Lupe Fiasco – Penz & The Needlz Lyrics on Rap Genius

Meaning

A play on words he is basically saying dont be cassette trippin. Play that shit man.

To help improve the meaning of these lyrics, visit “Penz & The Needlz” by Lupe Fiasco Lyrics and leave a comment on the lyrics box