I have kind of strong views about Urban Dictionary. Basically I'm thinking it's what Wikipedia would be if Wikipedia were really opinionated and not that funny.
To illustrate my point, the following is an Urban Dictionary definition of "oral sex":
The act of two persons using their mouths to perform sexual intercourse. These two persons can be of the same or opposite sex but they are rarely a married couple.
Now don't even try to say that I'm really opinionated and not that funny.