stemming from a french word, it originally meant "france sucks" but has now progressed to mean that what is being discussed is boring and pointless to discuss further and that you should really stop being such a tool.
tool: (see tool) bla bla bla bla de bla bla boring shit bla
bystander1: Jesus Christ! Coopchon
bystander2: yeah, he's right tool, shut the fuck up, no one cares.