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The term applenaut is derived from the act of smoking marijuana from a pipe made from an apple. Much like astronauts, when you smoke, your objective is to get high. Generally speaking, astronauts also get high when they are in space, hence the term applenaut.
Guy one: "Hey, how are we going to smoke this?"
Guy two: "Oh dude, we are totally going to applenaut this one!"
by Battletoads For Wii June 23, 2010