Chatspeak for "but".
It is a play on the image of a person's bottom (or butt) and taking this image putting it place of when one would say "but".
In a chatroom somewhere:

Jennifer: Guys are okay ( )( ) I prefer girls more.
Holly: Girls ftw
Jazz: YAY girls
Tyler: ( )( )... :/
by BêñjíButton June 29, 2009
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