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.
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