I'd nominate "yankee" but that word is complicated. To most people outside the USA (see below) it means "person from the USA"; to someone from the southern USA it means "person from the North"; to Northerners it means "New Englander"; and to New Englanders it refers to Boston Brahmin types with roots going back to England itself. So its meaning is roughly "the sort of prototypical American the speaker is not".
Additionally in Japan "yankee" is roughly synonymous with "gangsta". It refers to a subculture of school-aged delinquents who wear greaser style pompadours and are prone to get into fisticuffs. The Kunio-kun games (River City Ransom) and the main character of YuYu Hakusho provide examples.