(YouTube Personality Disorder)

An illness that shortens your attention span and causes you to be overly-obnoxious with references to videos you've watched online.
Guy 1: Man, your little brother won't watch a full TV episode or stop quoting the lame YouTubers that he's subscribed to.

Guy 2: Yeah, he's suffering from a severe case of YPD.
by ZippingToast March 22, 2015
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