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2.
Somebody who accuses other people of being fanboys over something, and then continues to say something themselves which is considered fanboy-ish.
Fanboy: Windows is rubbish man! Macs are so much better because you never get viruses and you don't kiss Bill Gates' ass!

Fannyboy: Shut up you stupid fanboy! Windows is so much better than crappy Mac, Macs are completely stupid and Windows is so much better because you don't kiss Steve Jobs' ass!

A Person: Wow, you are such a fannyboy, you call other people fanboys then be a fanboy yourself.....
by Wye Knott October 02, 2010
 
1.
Common New England term for someone who like it in the butt.
That guy is such a fanny boy, he takes it in the ass.
by FrogMoffit March 06, 2010