N' my flow pathetic, yea I'm so poetic
Even though I don't get my credit, but its copasetic
Everything I spit is so sick like my throat infected
I'm the illest nigga out, n' I ain't sold a record

from Cassidy – 11 Minute Freestyle on Hot 97 Lyrics on Rap Genius

Meaning

Copasetic: Is literally just a slang term, that means Cool or Good.
Copacetic: Which means in excellent order.

So both words are similar, so the meaning is basically the same for the line.

By saying his flow pathetic, he doesn’t mean it’s bad, he means it’s crazy good, as his knowledge of the English language, being metaphors, rhymes, etc, makes him so poetic. Everything he spit was crazy, and sick like a throat infection. An infection is a sickness, pretty easy to understand punchline.

He may not get the credit he deserved, but he was cool with it, everything was in good order.

He claims he is the best or illest rapper out, which relates to the throat infection line because another word for sick is ill.

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