someone who tries too hard. a poser. one of those chic's who holds the sign saying "Carson Daly is Hot." the asstard who goes to a rock show because they heard one of the songs on the radio or mtv. or someone who insists on wearing velour sweat suits. Avril Lavigne.
Jane is a tool because she dresses like Avril Lavigne while listening to New Found Glory and Dashboard Confessional just becuase Carson Daly told her to.
by sham February 08, 2003

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(n.) - an individual who willingly changes his or her behavior for personal gain or profit. In this context, a tool is similar to a poser, with one important distinction. Because a tool does not consider his actions beyond rudimentary cost/benefit analysis, he or she will often be co-opted by corporations or powerful interest groups to support the lame or corrupt positions held by these organizations. A tool therefore, is quite literally an instrument of the man.
Mitt Romney is a tool.
by Kenny Genius February 08, 2011

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The actual definition for a tool would have to be everyone if you follow the definitions of "poser." Don't kid yourself, you've tried to be someone you're not.
A tool is a gullible fool, which everyone was at one point.
So you wanna know who a tool is? Look in the mirror. Saying you're a tool because you listen to Good Charlotte? Please. You probably got made fun of for listening to them that's why you're saying it.
YOU ARE A TOOL. Thank you.
by RxKxO January 04, 2007

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a metal ish, cult ish band that kicks ass in many's opinion and plays in complex time signatures. It is criticized by many people and is criticized due to the fact that they never even took the time to try and get int tool and even though they say we jsut argue about stuff that we really dont know about, I wouldn't be talking considering if you don't like tool you probably know little to nothing about it so you should look into it. The singer is Maynard James Keenan, Bass player is Justin Chancellor, guitarist is Adam Jones, and the drummer is Danny Carey.
Dude I just heard Tool on the radio. Wow you don't hear that very often.
by mrtoast4 February 17, 2009

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guy that likes you, but when summer comes around, needs to try and get with every girl possible, ruining the relationship you could've had together. Even tho his reasoning is he "doesnt want to cheat on you" yeah bullshit. a tool then wants you to "forget" about him for the summer and then when school starts up again, you guys can go out, basically saying , let me hook up during summer and we can be together after.. and when he breaks up with you around spring time... you know why :)
omg tyler yocom is such a tool.
by littlemonkeylh June 29, 2009

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Someone who thinks he's cool, but he just isn't. He usually looks like a possum and says he's the man.
Pat: Meghan, I love you. I'm the fuckin' man.
Sean: He's such a tool.
by Joey Bagguhdonuts March 13, 2008

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A shithead, doper boyfriend who doesn't know how to treat a girl
My boyfriend's such a tool, he never does anything nice for me.
by ImBreeeee January 18, 2009

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1) Some who is used for the benefit of others.
2) Someone who does things so others will accept them.
People who wear aviators are tools.
People who use the word tool in daily conversation, because they think they understand what it means, are tools.
People with the initials J.D. are all tools.
by smity g July 10, 2008

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