A word used by Brits, Aussies, and various others to refer to Americans. Connotation can range from affectionate to pejorative. Often associated with tired stereotypes of Americans being, of course, fat and stupid people who all drive Hummers and love George Bush (all 32% of us!) and can't locate the planet Earth on a map.
Ironically, within the States, the term is used by the people who best fit said stereotype as a pejorative term for educated, left-leaning urban Northerners.
Chav on bus: Oy, mate! D'yeh think 'at fatty what jus' got on is a yank, like?
University student next to him: It's probably hard for someone who's never left Essex to understand, but...oh, nevermind. I like those Burbory shoelaces in your trainers.
Fellow who is very knowledgeable on the subject of psychoactive substances. Becoming something of a celebrity among internet drug geeks.
I've been curious about kratom ever since I read Murple's paper on erowid.