Coffee is one of the world's most popular drinks and goes by many names. Go Juice obvioulsy refers to the pick-me-up nature of caffiene and the fact that many feel they need a cup to get on the "go" first thing in the morning. The term "go-juice" is derived from the movie Waterworld, in which the same term actually refers to gasoline. It has also been popularized by college students to refer to the buying of a 5th of Monarch vodka and an equally sized bottle of tropicana orange juice, drinking half the orange juice and then filling it back up with half the bottle of vodka.
I think I'll stick to my Tim's dark roast. This cache will take you for a short jaunt down a summer road.