Any city/metro bus that there are only a few riders on.
(Years ago, Milwaukee buses used to be a "baby-poop" green, so we always called them the green limousine, the current ones are predominately a darker green) Generally, the actual color of the bus does not matter because all buses are "Green", ie; eco-stuff.
Dude, you work downtown, do you take your car?
No, parking is too expensive, so I take the green limousine.
The phenomenon of a person becoming more attractive by dint of their wealth. Most commonly used to refer to this phenomenon in someone who is otherwise unattractive for other reasons.
"How does John always get women? He's a fatso, smells bad and treats everyone like shit!" "He throws his money around. It's just green shift."