I can answer your question. A Fatty is something that was introduced to me by Fl Jeff (our illustrious Moderator). His directions are to take a one lb. chub (or several depending on your circumstance) of Jimmy Dean sausage. Remove it from the plastic wrap and put it into your smoker along with what ever else you're smoking (assume temp to be around 225*). At about an hour and a half, turn it once and smoke it for about another hour and a half. At that time it should be done. Bring it out, slice it and put the slices in hot biscuits. They're great! Also, if you're into sausage gravy, make some using the smoked sausage (fatty) and you will have another real taste treat.