Top Definition
Ion
Ion is used as a replacement for "I don't". This can be found especially on twitter.
Tweet: ion like driving at night.
by Airwick August 26, 2012

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ion
A word for idiots who don't know how to, or for some reason don't want to, spell out "i don't", making themselves look like morons.
When i see the word "ion" used as "i don't" i assume the person wasn't able to spell "don't" and/or didn't pay attention during sophomore Chemistry.

Swagger/Tumblr Wannabe: "Ion care she do wut she want."
Me: "An Ion is a particle with an electric charge because of the loss or gain of electrons, you halfwit idiotic fucktard."
by LimaRonan October 11, 2014

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ion
An ion is a molecule with a positive or negative charge.
Solvents consist of ions.
by Karel! June 29, 2006

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Ion
A term referring to a woman whose appearance can range from really good looking to downright ugly. As a result, males cannot categorize such a female on a scale of 1-10 as her ranking is incredibly volatile. Thus, their attractiveness is simplified to a different scale for this rare category of women which is marked by a +1 for looking good at the time or -1 for looking bad on an occasion, hence the term ion.
Damn that girl is such an ion, yesterday I would've banged her for sure but today she looks like snooki's asshole.
by Slumdog23 October 26, 2010

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ion
Ion; the Internation Order of Ninjas.
The Internation Order of Ninjas is a non-profit organization dedicated to the betterment of ninjas world wide. They aid in the exploration of the "Theorial Plain" in which all ninjas must abide in order to gain the skills necesary for the physical, mental, and most importantly, spiritual control that one must have to live as a ninja.
No, I do not belong to the federation of killacon, but rather to the ION.
by UberChoob May 24, 2006

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ION
An acronym for in other news, used to abruptly segue into a different topic in the same post. In more humorous uses, it can 'ironically' segue into something actually strongly related to the first topic. Compare BTW.
... So yeah, my g/f is bound to dump me any day now. ION, Guitar Hero 3 is the awesomest thing in the history of stuff.
by adick87 February 10, 2008

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ion
Brett Gill's favorite word. This word is used by illiterate people who are to lazy to use proper grammar. Word translates to "I don't"
Niggas ion even kno like wussup. Niggas talk to much shut the fuck up
by gamergirl6969 August 04, 2014

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