Meryl claims initial use of the term "Jew Cooties," and chances are it creeped into my subconscious from reading her excellent blog.
However, I can say that the term was used earlier than her stated coining in February of 2005.
It was used in 2001 in a posting in an Atlanta newsgroup (in reference to a church that would not allow a rabbi to address the congregation.) It was also used in 2003 in another newsgroup article insulting an anti-semite who was railing against the "kosher tax" we are all horribly forced to pay when we buy our Oreos.
So, I'm sorry, Meryl, but chances are you will not get rich from copyrighting the term.