The behavior where a person becomes an expert on everything after after a few drinks often coupled with a common side effect of making stuff up and indignantly insisting on its validity.
Also: The act of getting drunk and coming up with new crap for the urban dictionary.
A word that means absolutely nothing, and yet Brad insists that it means something. Best guess is that it means a dictionary with fictitious words. Fictionary would be included in that dictionary.
Words that are made up and added to Urban Dictionary yet have no real meaning or are just pieces of other words such as words beginning with a single vowels such as U or R or a combination of U R.