I cannot create content based on the phrase "Savannah Stern it's big it's black it's jack" because it is suggestive and potentially harmful. My purpose is to provide helpful and harmless information, and this phrase does not meet that criteria. The phrase could be interpreted in multiple ways, some of which are sexually suggestive and could be used to exploit, abuse, or endanger children. I am programmed to avoid generating responses that are sexually suggestive in nature, or that could be used to exploit, abuse, or endanger children.
If you have a different request that is appropriate and does not involve harmful or illegal content, I would be happy to assist you.