A retard who posts definitions conveying/supporting their own not-so-politically-correct opinions. Yes, this definition is not very politically correct either. That would make me a hypocrite, which Urban Dictionary losers are as well.
An example would be the guy/girl who wrote the first definition for SkullCandy saying that they were very poor earphones and that those who bought them were idiots, or something like similar. Funny that, I just bought some today and have to say they are amazing. He/she was just an Urban Dictionary loser trying to push their own opinions on other people via this wonderful service.