A part of the chaos theory that states that one small change in a situation(expieramental noise) can drastically change the outcome of an event. Butterfly comes from the example of the flap of a butterfly's wing altering the atmosphere around it causing(or preventing) a major event somewhere else.

Also a movie with that Ashton Cootchie
Example 1: The Butterfly effect is a cool mathematical theory.

Example 2: The Butterfly effect was supposedly based on Chaos Theroy although there is no correlation whatsoever.
by Ryan July 27, 2004
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A small gesture or action in the present that can generate significant results in the future.
My client just referred their friend to me to help them find a home.

Sounds like The Butterfly Effect is in full motion!
by butterflyonthemove May 24, 2011
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A phenomenal movie, probably the best thing Ashton Kutcher ever did. Forwned upon by stupid frat boys who can't handle Ashton Kutcher trying to do something serious, and always need visual effects to entertain their brains.

Despite this, The Butterfly Effect (2004) is an amazing movie, with real feeling, complexity, message, and unfortunately, some shitty straight-to-DVD sequels.
1: uuugggh "the butterfly effect" sucked, it had message and complexity, and was a great exception for Ashton kutcher, waaaa! I wanted boobies and football and robots in the movie so I didn't have to think! *pouts*

2: Yeah....you're a moron. No comment.
by Everythiiiiiiiiiing July 14, 2009
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The butterfly effect is a phrase that encapsulates the more technical notion of sensitive dependence on initial conditions in chaos theory. Small variations of the initial condition of a dynamical system may produce large variations in the long term behavior of the system. This is sometimes presented as esoteric behavior, but can be exhibited by very simple systems: for example, a ball placed at the crest of a hill might roll into any of several valleys depending on slight differences in initial position.
sensitive dependence on initial conditions in chaos theory is commonly presented in this. "A butterfly flaps its wings in Japan which causes tiny changes in the atmosphere, which ultimately cause a tornado to appear half way across the world. This is where the term "The Butterfly effect" comes from.
by Postremo Scientia January 3, 2007
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A band from Brisbane, Australia that has not made a wrong move in making songs as of yet. All great songs.
Best songs include 'Crave' 'One Second of Insanity' 'Black Lung' 'Always'.
by Luke Dyson March 16, 2004
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Australian hard rock band from Brisbane, Australia.

Released their debut EP in 2001 "The Butterfly Effect" which features their debut single "Take It Away", followed up with their debut album in 2002 "Begins Here" which features the singles "Crave", "One Second of Insanity" and "Always". In 2005 they recorded their next single "Phoenix" which isn't featured on any of their albums. In 2006 they released their 2nd studio album "Imago" which debut at number 2 on the ARIA charts, and features the ARIA top 10 single "A Slow Descent" as well as the singles "Gone" and "Reach".
I saw The Butterfly Effect on NYE, awesome Aussie band live and in the studio! Check them out!
by itsNinty January 13, 2007
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An illegal underground sex move where a man approaches a female in a group of friends, generally at a bar. After failing to hook up, the man walks away, then waits for her to be separated from her party. Once alone, he proceeds to knock her out and have his way. Once finished, he quietly returns her to the bar, so she wakes up seamlessly to her friends, as though nothing happened.
That hot chick totally blew me off, so I gave her the butterfly effect.
by darthdrg July 7, 2009
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