A more proper term to describe a professional bullshitter. One who brags constantly and unnecessarily. "Bovine" referring to cattle (i.e. Bull), and "Scatologist" (one who analyzes excrement).
Bill: "What this I hear about you and Tom getting it on last night?"
Mary: "Don't believe everything Tom tells you. I asked him to gave me a ride home. That's all. He's just BSing you."
Shitologist: "One time, i had to pee so bad, that the stream of urine in the toilet made a hole right through it, ripped the tile out of the ground, went into the neighbors house. And when the neighbors knocked on my door saying WTF? i peed a hole through his head!