As I google on this Snollygoster that is so hot in google trends, I found out that there is no official meaning as wikipedia is concern. This is only what I found;

1. Snollygoster is monster that preyed on goose, chickens or kids.
2. Snollygoster refers to politicians whose main agenda in the government office is to satisfy his personal needs and wants and not to his constituents.

It's up to you what to choose and how you will you this term. See Video Below