- Poly- is a Greek prefix meaning "many."
- Ticks are small arachnids that live off the blood of humans and other animals. They often carry and spread disease and are generally nasty little creatures.
So, "politics" refers to a large quantity of blood-sucking, invertebrate vermin that spread disease and misery to their hosts. Probably makes a great deal more sense than the actual etymology.
Apologies if this joke has been done before. It is such an easy joke and on such a popular them, I can't imagine that other people would not have stumbled onto it first.