People who put on a show of being happy all the time, whistling, singing, trying to draw as much attention to themselves as possible
Like they are over compensating
(
Mykeyboy A massive, salty filing cabinet, Fri 5 Jun 2009, 16:30,
archived)
Dale Winton syndrome.
He strikes me as depressed, possibly because of the 'YAY'ness of him.
(
Captain Wow currently being a cunt in Infamous, Fri 5 Jun 2009, 16:33,
archived)