Someone who writes Urban Dictionary definitions about themselves, or people who they know, but who are not famous. Esp. when those definition is "*insert name here* is very cool and attractive."
The act of jerking off while reading all of the half ass, simplistic definitions on urban dictionary that some people seem to think are cleaver or funny.
Regular Person: Hey, you want to go do something productive with our time.
Looser: Nah, I'm going to throw my life away online having urbanal sex.