Someone who is always looking up words on urban dictionary to use in everyday life. They are addicted or obsessed with the site. They use the words so much they become annoying and no one wants to talk to them.
Guy 1:Yo you think that girl is a cunty slut.
Guy 2: Don't know what it means
Guy 1: You should look it up on urban dictionary then
Guy 2: You're an urban dichead
Guy 1: What's that?