A Tool is someone who tries to fit in by doing what ever there told. A tool will drive attention to itself to look cool, the tool is used for money and other goods to keep its "Group" happy. They are the "Groups" Tool, and the tool shall be used. Tools usually pose to be something they aren't.
Justin Bieber and all of his fans are Tools
Lil Wayne is a tool (And a Poser just sayin)