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a person who is just really really fun. Every aspect of their life is fun, anything they do is fun and everyone around them generally just has fun.
Jon and Jules are sitting in the room.
Peter walks into the room.
Jon says to Jules, "did this room just get fun?"
Jules replies, "it certainly did and its becuase peter is a fun dude!"
by hughjorgan123 August 15, 2009
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