fenakoko
fenakoko is the definition of a person that is mentally unstable and crazy. Always spelled with a lowercase f, and is only used on people who are 4, 14, 24, 34, 44, 54, 64, 74, 84, 94, 104, 114 etc...
Person 1: This guy is so weird
Person 2: I know, totally fenakoko
Person 2: I know, totally fenakoko