2 definition by waterygrave

Top Definition
Trends that are just past their prime. Often, a sizable number of people will not be aware that this has happened.
Those jeans are untrending so fast, they'll be 20 dollars in a month.
by waterygrave November 27, 2010

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Someone that, in adulthood, proudly maintains juvenile tendencies. A kidult may be 39, yet still play video games and drink energy drinks, and kick ass at both.
Hells yeah I got the new CoD on my xbox 720*, fool. I'm a kidult after all.

*trying to future proof the sentence
by waterygrave March 04, 2011

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