My guess is that it is the top of a bird's head with a ? in it because we never know what they are thinking... ok that's the best I can do.
I ban you for trying to make me search for the meaning of "yowo".
Link to the post? Maybe? Hehe.
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Never forget:
Leaf - 11/5/07
Louie - 1/25/08
Bill - 4/16/08
Papeete - 4/21/08