Tool: (noun)

1.) A guy with a hugely over-inflated ego, who in an attempt to get un-due attention for himself, will act like a jackass, because, in his deluded state, he will think it's going to make him look cool, or make others want to be like him. The person may even insincerely apologize later on, but only in an attempt to get more attention, or to excuse his blatantly intentional, and unrepentantly tool-ish behavior.

2.) Someone whose ego FAR exceeds his talent, intelligence, and likeability. But, of course, he is clueless regarding that fact. He erroneously thinks he is THE MAN!

3.) Someone who others normally refer to as a prick, dick, or schmuck.

4.) Someone who acts like a dick, because...well...he's compensating.

5.) Kanye West
Example:

Observer #1: Hey, did you see Kanye West's idiotic stunt at the awards show?

Observer #2: Oh, you mean, "Mr. It's-All-About Me?"

Observer #1: Yeah...what an asshole.

Observer #2: I know. He's such a tool!
by Hilo, Hawai'i September 18, 2009
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Anyone who tries to act cooler than they actually are. Most tools are usually douchebags with negative self-esteem.

Synonyms: Asshole, poser, faker, douchebag, Dane Cook.
Man: Wow, Dane Cook is not funny at all. What an asshole.
Man 2: Damn, you're right. What a tool.
by BigCron August 12, 2009
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An often disliked person who screws people over instead of using common sense to deal with situations. Likes to command people to compensate for his small penis.
Wtf, Jerry really had to fuck us over this time. What a tool.
by Some dude1231 May 1, 2011
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An individual who behaves in their own self interest rather than adhering to a set of beliefs or morals. Someone who will act as though to seek approval on the outside, but is actually quite vain and selfish. Men of this variety tend to cheat on their girlfriends. Women tend to use men to obtain free drinks.
God, Brett is such a tool.
by redwikiwine September 10, 2009
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That one guy with the tribal arm tattoo and does everything that maxim and mens health tells him to do. We all know this guy!
Remember that week when spinning rims were cool? yeah he had them , yeah john is still wearing his collar all the way up what a Tool!!
by GorrilaVich July 11, 2008
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The first against the wall when the revolution comes. An inferior, low or no-self esteem individual who gets off obeying authority figures. One used by his superiors, who themselves undoubtedly would kick them to the curb in a heartbeat. Nevertheless, the tool believes they are worthy and significant STRICTLY because they have attached their whole sense of self to obeying said authority and/or submitting their individuality to another. Could be a woman...but is much more pronounced when seen in a "man".
Glenn Beck is such a tool for corporate power, bending over and spreading cheeks for hateful robber barons who are raping the working poor with their usurious practices.
by mowriter January 21, 2010
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Almost synonymous to douche bag; the type of person that likes to show off their physique in public; wears athletic clothing in the dead of Winter (Basketball shorts with long black socks); laughs at their own non-hilarious jokes; under the false assumption that they are perfect; whines like a spoiled 5-year-old when something doesn't go their way
"Ben is such a tool in the morning when he thinks it's cool to choke people and throw them into the wall."

"Ben laughs like a walrus when he thinks his own jokes are funny."

"Ryan always sounds like he's on Oprah when complaining in Chemistry."
by mattyjoe28 March 31, 2010
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