Noun - frequently used as a medical term to diagnose unknown diseases, conditions and/or symptoms that afflict young, crazy motherfuckers.
"Sheesh, Chris, what the hell is that weird rash on your leg."
"I'm not sure, Bob. Doctor's have no clue. They think it's Goochitis."
An inflammatory condition of the gooch, resulting in extreme itchiness; can cause one to walk similarly to a person with saddle sore.
"I've been working so damn hard, my goochitis is flaring up!"