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1.
A person who overuses gestures in Second Life. Usually about audio gestures, but can apply to excessive text art, or indeed any brainless spamming of chat.
Joe: Hooooo!
Joe: Hooooo!
Joe: Hooooo!
Mitzy: Stop being such a hootard.

by SLingo Watcher January 31, 2009
 
2.
When someone is so dumb they would even be considered a retard in Whoville.
"Oh my god, Christie, that apple is SO green and shiny!"
"Damnit, Billy, you're such a hootard."
by Marilyn and Tori June 20, 2007