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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 17, 2009
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2
One who lacks the mental capacity to know he is being used. A fool. A cretin. Characterized by low intelligence and/or self-steem.
That tool dosen't even know she's just using him.
by tt February 18, 2003
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3
An individual (typically sheltered white suburban kids from upper middle class families) who feels that they need to follow all the latest trends and fads religiously, and pretend to be someone they're not in order to be accepted by others, making themselves look like complete idiots. Similar to sheeple.
Tool: "I was camping outside the apple store the night before the latest Iphone release, and my man-bun fell out, so I had to put on my fedora #badhairday"
by A WHITE GUY June 13, 2017
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4
That guy who makes us shake our head in disbelief but at the same time makes us feel better about ourselves since we are not him.
"Jake just spent $80 buying those hot chick shots and then they walked off with those other guys!" "He's such a tool!"

by toolguru October 23, 2007
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5
Contrary to what many people (usually tools) think, being a tool has nothing to do with being easily manipulated. Those people are simply "suckers". In fact, tools often take life too seriously, and therefore try too hard to manipulate others and to win everything, but always playing by the rules of society. Intellectual pursuits are not of any interest to a tool, and people who are interested in them are "stuck-up" or "faggy". A tool just likes to have a few beers, watch and talk about sports constantly, and refer to women as "sluts" and themselves "players". Tools are usually borderline retarded, but hide it well because they have the uncanny ability to conform almost perfectly to social norms.
If a movie, or song becomes popular in society, the tool will quickly adapt said movie or song as one of their favorites (see Lil' Jon, Souljah Boy, Boondock Saints). Their "social commentary" is often crudely taken from the last episode of South Park.

A tool can usually be spotted wearing a backwards baseball cap and athletic attire, playing beer pong at any large, obnoxious party where loud mainstream rap music is played.
"Whoaaaaaaaaa, party foul bro! What a fag!"

"Wow, that guy is such a tool."
by Todd Clemens February 16, 2008
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6
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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7
A person, typically male, who says or does things that cause you to give them a 'what-are-you-even-doing-here' look. The 'what-are-you-even-doing-here' look is classified by a glare in the tool's direction and is usually accompanied by muttering of how big of a tool they are. The tool is usually someone who is unwelcome but no one has the balls to tell them to get lost. The tool is alwasys making comments that are out-of-place, out-of-line or just plain stupid. The tool is always trying too hard to fit in, and because of this, never will. However, the tool is useful because you can use them for things; money, rides, ect.
"Let's drive to Chicago from Iowa. Oh man, we need money. Hey, let's ask tool to come, he'll spot us the cash!"

"Tool is our friend. We call him that because he is one."
by Shannon J. August 08, 2005
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