tool is a very versatile, insulting name. synonymous with the word douche
, a tool is a guy, or possibly a girl, who has an obvious negative character trait. this can be said about a known person, or about an unknown person, i.e. during peoplewatching.
the negative character trait can be anything from wearing something stupid, to being way overconfident, to being a jerk.
Variations include: toolbag
(guy walks past with uggs on and a pink v-neck
Me: That guy looks like a tool. Check out his douchebag-status uggs and pink v.
(speaking about a friend who ditched me for the 'popular gang')
Me: Wow, John is such a tool. He think he's so popular and badass.
(speaking about a fellow peer who hit his girlfriend during a fight)
Me: Wtf, Joe freakin' hit his girlfriend today! I hereby declare he is a huge tool.