Like a banana but without the beauty. And not like a banana either.
Banana Republican: A person who has always wanted to run away to a banana republic, and write a novel about it, but decided to invade instead. This person puts up a mansion, a high, razor-wire-topped wall, hires guards and servants, and then heaves a giant sigh of relief at having escaped the rat race and all care.
Banana Republican: An individual who can't compete at home, and so goes to where $20,000 will buy half the country, puts up a sweatshop or two, and proceeds to stand in for the lord and master of all creation.
Banana Republican: A person with the above attitudes but without financial resources who still nevertheless asserts supremacy based on who knows what criteria. This is an incurable disease.