A huge, useless book filled with definitions of words that are of less importance than anything on Urban Dictionary.
Guy 1: "Hey, what are you reading?"
Guy 3: "An average dictionary, why?"
Guy 58: "You n00b! Average Dictionary < Urban Dictionary!"
The average urban dictionary writer will make any word seem sexual, literally any word.
Mark: Hey man, can you tell me what the word 'sit' means?
Average Urban Dictionary Writer: It means that a girl sat on a mans penis