Someone who puts 100% serious definitions for the words that they submit, when they clearly don't understand that this is meant to be a fun website - not just a regular dictionary
I just witnessed 2 Serious Urban Dictionarians at work and i decided to post this
Dictionarians are people who constantly know the definition to every word, and say the definition as if they were reading straight off the dictionary. In addition, they create new words such as, armpitea, fracklespackle, etc.