Someone (tends to be a girl) who is very very very VERY annoying. An obsessive person who thinks he/she know everything about something (like animals, a person, a sport, ect.). He/she will be obsessed with a few random things and most likely you. Once they decide they like someone they are 'best friends' with them, no matter how the other person feels. They aren't very likable so if something bad happens to them they will use that to make people feel bad for them. Not very bright. Actually just plain stupid. Fat. A wimp who is convinced he/she is tougher than you, though the only way it could hurt you is if it sat on you.
Person 1 "That bitch is such an annoying fuck!"
Person 2 "Yeah..."
Person 1 "Is there even a word for someone like that?"
Person 2 "Yeah, a Morriah."
Person 1 -facepalm- "I should've guessed"