The face perpetually plastered on Sweet Bro's face in the web comic Sweet Bro and Hella Jeff. The face has been referenced in another web comic, Homestuck.
Sweet Bro: :y
where doing this, man,
where MAKING THIS HAPEN
A worthless emotioncon. Like :u and such.
Can only be used in front of y. (see example)
There is also only one in existence.
WTF: Hey, cool worthless emotioncon! =D
It's the Joker.
:y why so serious?
An emoticon, mostly used on MSN to express yourself as being annoyed or mad. The emoticon on MSN has a pretty funny look. It is also used in other websites and forums etc.
Random idiot : Hi!
Random idiot 2 : Hello.
Random idiot : Umadbro?
Random idiot 2 : :Y