A British citizen with an American visa, who pretends to be a citizen in America. When in England, this person will claim that Americans suck, but when in America this person will claim that British people suck. Normally this individual is a master of accents and usually works as a musician or author.
Refers to someone who is either super-pushy about trying to bribe others to behave unethically/illegally on his behalf, or who is a total a**h**e to everyone unless he is bribed in some way --- money, sex, fancy meals, being catered to and/or waited on hand-and-foot, etc. --- think Ethan Couch, or maybe Varuca Salt of Wonka's chocolate-factory fame.