Y'all niggas better not call the law, get no blood on my Audemar
Meaning y'all better not waste my time when y'all ready I take you all to war

from J. Cole (Ft. Jay Z) – Mr Nice Watch Lyrics on Rap Genius

Meaning

Jay is ready for a scuffle if they are, so when he starts firing, they better not call the cops.

He has made it clear that he’s from Brooklyn and is willing to get his hands dirty:

Get your chain tooken
I might do it myself

Even if he will fight, he’s not getting blood (maybe a particular Blood…) on his timepiece.

“No blood on my Audemar” could also mean don’t “kill” his watch as in don’t “waste” his time.

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