Damian I hate to disagree but Judges seldom laugh anyone out of court. They generally take slander and libel seriously and even if you do prevail the cost to defend yourself can run into the tens of thousands of dollars.
Joaquin for legal advice its always best to consult an attorney and not rely on the oppinions of webmasters. There are Legal sites and online business law specialists who could provide you with accurate information on this.
Its fun to kick these things around amongst ourselves for discussion, but thats not a subsitute for legal counsel.