A fork of Rural Dictionary
Taken from the book of the same name, an Ugly American is an American citizen that visits a foreign country and views everything from an American standard, refusing to acknowledge local culture and standards. Because of this ethnocentric viewpoint, the American is often ignorant to or dismissive of the foreign culture and is perceived as rude.
While visiting China, Fred refused to eat anything that wasn't from the lobby of the Hilton and referred to everyone as "Wong". Fred is an Ugly American.