What is Limousine liberal?

Limousine liberal and latte liberal are pejorative U.S. political terms used to illustrate hypocritical behavior by political liberals of upper class or upper middle class status. The label stems primarily from unwillingness of limousine liberals to practice the views they purport to uphold, e.g. calling for the use of public transportation while frequently using privately owned luxury transportation, especially by limousines or private jets in the case of the extremely affluent, claiming environmental consciousness but driving fuel inefficient vehicles, or ostensibly supporting public education while sending their children to exclusive private schools with high tuition fees.