Top definition
When you take a word away from popular use, and declare it to be 'over'.
Dude 1: "I decoined 'YOLO' 'cause I heard my Dad using it yesterday, bro."

Dude 2: "Totes, bro. I'm coining, 'Decoined' dude."

Dude 1: "Dude, yea-lol. Submit it to Urban Dictionary!"

Dude 2: "Fosho!"
by Cremebruleed July 06, 2012
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