Back in the lab with Mac again
Hot 97 bars -- we're going back-to-back again

from Freeway – When I Rap Lyrics on Rap Genius

Meaning

This is Free’s way of letting his fans know that he is again collaborating with his mentor and former group-mate in State Property Beanie Sigel, also known as “Beanie Mack”

The two artists have always had great chemistry, as shown in their biggest collaborative hit, the duet “Roc the Mic”. The “Hot 97” line refers to the fact that the State Property rappers first came to prominence by appearing on New York City radio station Hot 97 with Jay-Z in 2001. See here for details

To help improve the meaning of these lyrics, visit “When I Rap” by Freeway Lyrics and leave a comment on the lyrics box