Top Definition
An idiot or someone who does something stupid and random.

Something my friends made up...and it stuck.
"Oh my fucking're such a fanny head!"
by HLou March 05, 2005
An adjective, can be used affectionately or as an insult.
Rose you fannyhead! love you!

piss off fannyhead, just cos i could hardly cum at your ugly mug.
by Embert April 24, 2010
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