An Urban Dick is someone who writes about their own name in Urban Dictionary because they can never get a date and spend the majority of their time on discord harassing underaged people on discord whilst pinching their own nipples fantasizing about League of Legends characters. They often ask why no one loves them in their mother's basement and use Urban Dictionary to feel better about themselves.
Person 1: did you see what (Person 3) Posted on the Urban dictionary about himself? It's Kinda creepy.
Person 2: Yeah, he's such an Urban Dick.