Someone who constantly ruins their sleep schedule, through no real fault of their own.

A yuppie with a social conscience. Someone 'green' who loves the earth as much as money.

In Swahili (the lingua franca of East Africa): someone who wanders without purpose / someone constantly on the move.
It came to be applied to all white people in East Africa, as most were encountered as traders, visiting colonial officials or tourists.
Today, white tourists are often greeted (especially by children) with the cry: "Bye bye mzungu!"
For some reason, they rarely say "Hello mzungu!" when they see one coming...

An Asian male who has defined, muscular abdominal muscles that look like the subdivided parts of a chocolate bar.

The term one uses when a person develops a strong emotional attachment towards a machine or a robot.

The face of an actor who is playing a character in a period piece but has a modern looking face– like they would know what an iPhone is.