Trickititis - is the disease of acting like a trick. A trick is defined as being girl who is tease, hoe, or just a dumb bitch. A trick can also be a substitute to calling someone a bitch. Almost like a nice way of saying it. Trickititis can be sometimes very contagious. Not physically but emotionally/mentally.
Doctor Explains to the girl's friends,
Doctor: "So the girl is at the party just sitting on the couch while everyone else is up and having fun"?
Doctor: "She is being boring and lame?"
Doctor: "I think i know what is wrong with her. She has a disease that effects her partying mood. The disease is known as Trickititis. It is sometimes common in young females."
Friends: "I knew it!"