Ucfs stands for Un-Controable Face Syndrome.
When an enemy or a person you dislike, etc.
Starts on you, calls you names etc. The best insult to basically say that they are ugly, and confuse them is to tell them they have ucfs
Erin: URGH, I FxCKING HATE YOU JODIE YOUR LIKE SO WELL LIKE NASTY!
Jodie: I'd rather be nasty than have Ucfs! :\