UDT syndrome is called "Uncontrollable Double-Tap" syndrome. You can know if you are experiencing this syndrome if you double-tap almost everything on Instagram. However, this definition applies more to people who accidentally like someone's 64 weeks old picture.
Person: "Why are you liking all the pics?"
Person 2: "uhjj ever heard of UDT syndrome?!"

Or

Person A: "I liked my ex-boyfriend's photo from 128 weeks ago!!!"
by QuickFeetDawgg June 19, 2015
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