Or, a goblin that like knobs.
While camping, Derek walked into the woods to take a leak, and was immediately fellated by a knob goblin. There were no survivors.
2) The porn alter-ego of Spideman's nemesis.
Rural usage: "Damn boy, whoooeee! That Knob Goblin sure smoked The Whole Ten Yards and good!"
Comic book usage: "Spidey sure didn't stand a chance against the Knob Goblin. His weapons are fierce!"