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."
Someone who studies the physiological, pathophysiological, anatomical as well as politico-socioeconomic characteristics of the male scrotum.
While examining my inguinal canal prior to hernia repair surgery the nurse examined and manipulated my ball sack so closely and delicately that she must have been a scrotologist.
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!