One who believes in, and is a firm supporter of, anything and everything the Republican Party says or does. Regardless of how ridiculous an action might have been, or even if a statement is proven to be false, a repubot will adamantly defend the erroneous act or statement as long as the perpetrator was a Republican. This robot-like reaction is unfaltering in a repubot, and lead to the creation of the word - a combination of Republican and Robot.
Rick is such a repubot... He even thinks Bush did a great job!