Cobras try bitin him
But cold blood's thicker than the ink you writin in

from Pro Era (Ft. Chuck Strangers, Joey BADA$$ & Kirk Knight) – F a Rap Critic Lyrics on Rap Genius

Meaning

Cobras are cold blooded animals, meaning that they shift their body’s inner thermometer to match the temperature of the atmosphere around them. Joey also takes a jab at the old German proverb “Blood is thicker than water” by saying that him and his “family” (crew) write cold blooded lyrics that are more chock full of references than other rapper’s rhymes.

http://en.wikipedia.org/wiki/Blood_is_thicker_than_water

Also, his blood is so cold that when haters (snakes) try to bite him with their disses (in ink), it doesn’t affect him. Literally, the blood is too cold for the venom to have an effect. Also the last line should be “cold blood’s” not “cold’s blood”, as in “cold blood is…”.

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