Short for "Deconstruction" only known to be used on the online first person shooter "Tremulous". Decon is an act of deconstructing buildings the players have built in-game.
What a log from tremulous may look like:

Machinegun Turret built by Builder

Machinegun Turret deconstructed by Stupididiot

Builder: PLEASE don't decon -_-
by Iswallowedsomevomit January 15, 2009
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Decon is an amazing and kind person who has a unique style and aura. People can easily get lost in their eyes or in the conversational skills.

Everyday is a good day with a Decon.
Person 1: I’m not feeling good today.

Person 2: Maybe you should go hang out with Decon? They always make me feel better.
by B31317 April 2, 2018
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An artistic, architectural, or design aesthetic consisting of clean smooth surfaces, and other aesthetic elements motivated by the theme of decontamination.
The recent anthrax scares have led us toward a deconist aesthetic with an abundance of white ceramic tiles, as if the whole world's at once a shower room and decon facility.
by Prof. Steve Mann December 7, 2003
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often a snecky person weres hat belives in god often known as snecky decon the decon is commom in most parts of the country mainly churches collectivly know as snecky decons the decon may also be devious
that decon is snecky
by Adam Andrews October 22, 2006
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verb- Often used by people within the gaming community as a shortened version for "disconnect."
Gamer 1: "Hey, where did you go?"

Gamer 2: "Sorry, I had to decon because my mom's yelling at me again for forgetting the cat in the microwave."
by Zenniverse March 19, 2020
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