The term Ugly American is an epithet and is used to refer to the perceptions of the loud, arrogant, demeaning, thoughtless and ethnocentric behavior of the average American citizen.
Although the term is usually applied to travellers and tourists, it's also applies to the US corporate businesses in the international arena.
An "Ugly American" is a loud, boorish, nationalistic American, especially traveling abroad, who conforms to a stereotype that gives Americans a bad reputation. They are the ones that remain ignorant of the local culture and judge everything by American standards.
Are you an "Ugly America"?