"Rockies" in prison so its pugilism through these bars
Means our punchlines are like 2 fists giving bruising scars

from ForestPunk – Be Smart Lyrics on Rap Genius

Meaning

Grade A muhfuckin' lyricism right here son. Remember Rocky?
https://www.youtube.com/watch?v=t1yzIeBRh5o (Sylvester Stallone: ADRIAAAAAN) Ok so he is a boxer ok, follow me here. Pugilism is making money boxing. When you are in prison you are behind BARS, which anyone who follows rap knows that BARS are the lines you be spittin' on them instrumentals. So Rockies in prison means he is spitting PUNCHLINES BEHIND HIS BARS. This is further corroborated (A Ha didn’t know that word did you?) by the second part of the line, “means our punchlines are like 2 fists giving bruising scars.” The Punchline AND the explanation in THE SAME LINE. (Applause).

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