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The act of masturbating whilst hanging upside down opposite a powerful fan with a spiderman mask only half on ones face. One then ejaculates into ones hand and slings it into the fan like the famous webslinger. The fan then it blows the jizm back onto oneself - preferably in the chest.
hey man i was bored last night so I totally Spiderfanned myself FAP! FAP! FAP! FAP! FAP!

I heard that Brad gave himself the old Spiderfan last night. That's probably why his shirt is sticking to his chest.
by Virender Shewag December 08, 2011
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