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In a teamwork situation, an extremely irrational person, who takes charge of a project through sheer force of will rather than competence and leads it in a direction which guarantees failure.

Background: The Don Quixote of literature had a tendency to do extraordinarily stupid things without thinking them through. But people were loathe to try and stop him on account of his being a few cans short of a six pack.
I am officially referring to my project leader as "Don Quixote" from this point on. She's got the idea in her head that she, rather than the boss, defines the project KPIs. I'm going along with it because a good performance appraisal is not worth the next few months of my life being made a living hell by that crazy-ass bitch!
by Korgmeister April 02, 2005
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Someone who is idealistic, and believes in justice, and is on a quest to save the world or someone, no matter how absurd the reality of accomplishing it is.
Eric was a Don Quixote when he thought he could save Gina from drugs. She's been hooked on crack for over a decade, and still hangs around dopeboys. He is out of his head on a lost cause.
by Eric Platt June 29, 2009
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1. To be afflicted with or exhibiting irrationality and mental unsoundness.

2. One who is an imbecile.
Setting: A & B stare in horror as imbecile runs towards an old woman yelling about a princess.

A: Who the bloody hell is that nutter?
B: Oh, that's Jeremy. I always knew this would happen. Looks like he's finally gone Don Quixote on us.
A: Ahhhh yes. Well will you look at that he's just hit a windmill.
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When you prop up a girls hips, and she is soaking wet, fuck her hard until you cum in her. Then piss in her while she is still propped up. Then you stick your finger in her cum and piss filled pussy, spin it around to get it all coated with the stank brew, use your finger to draw a mustache on your passed out buddy's face.
(When your buddy wakes up). "Hey, what is that awful smell?"
(You reply)"I totally gave you a Don Quixote with that nasty skank I fucked last night!"
by Dave the Sick Fuck January 20, 2009
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A general sexual verb. Usually found in the past tense as in "donquixoted"
"Dudddeee... Last night I totally donquixoted that bitch!"
by Colin Dubs October 29, 2008
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