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1.
The opposite of fun.
My date last night was horrible! No matter what I suggested, she just didn't want to do anything! She was so antifun!
de Babo Sang Pyo 30 octobre 2005
 
2.
Someone who is absolutely hell-bent on not having a good time or, more importantly, has a great way of curtailing others having a fun time
My boss wouldn't let me have an hour off to catch the game. He really is the anti fun
de Neil73 26 mars 2007