This just round one, 15 rounds B

from Cam'ron (Ft. Max B) – You Gotta Love It (Jay-Z Diss) Lyrics on Rap Genius

Meaning

Although Cam'ron spit 3 full verses and one part-verse dissing Jay-Z, Cam says that this is just the start of the beef.
If Jay comes back, Cam is just going to come back, and fight for as long as it takes.
This is a reference to boxing, where a full match used to be 15 rounds, so Cam is saying he’s going to ‘go the distance’ with Jay, if he has to. .

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