A mental disorder where a person cannot help but make up absurd comments and/or lies. Even if repeatedly asked to stop or even threatened, the person will continue to create bullshit comment/remarks about someone.
Guy 1: Thom just told me that you were in a gay porno.
Guy 2: Thats Bullshit! he's lying.
One day later....
Guy 1:Thom said you have a crush on our male foreign language teacher.
Guy 2: WTF that's a lie. Man, the amount of bullshit Thom can make up is unbelievable he must have Unlimited Bullshit Disorder.