Does anyone know the name of this novel (or the author) being described by these woefully inadequate clues?

One of the main antagonists has the nickname "Chemo." He has a disfigured face because his dermatologist had a stroke while performing a procedure on Chemo (and valiantly tried to continue). Later in the novel, I believe Chemo gets his lower arm bitten off by a barracuda. Rather than a regular prosthesis, he opts for a small weed eater. He then proceeds to thrash people's plants.