A nickname for failed 2008 Republican Vice Presidential Candidate, Sarah Palin. The nickname plays off of the winter weather predominant in Palin's home state of Alaska, combined with the popular Jersey Shore character, Nicole "Snooki" Polizzi, who has a similar IQ and who also says things that make people want to punch her in the face.
Did you hear what Snowball Snooki just tweeted? I can't believe anybody would say something like that! If she keeps talking like that, I'll probably punch her in the face!