knob-end

noun3

1. •
   (slang, vulgar) The glans penis

   • He appreciated a man giving head as much as anyone, and he was sure as hell gonna enjoy the feel of his knob-end slipping between Casey's hungry lips. — 2006
2. •
   (vulgar, offensive) A stupid or contemptible person

   • Why did these knob-ends so much want us to fail? — 2001
3. •
   (informal) The heel of a loaf of bread.

   • […] the knob end of a moldy loaf of bread. He was halfway through chewing it when he was aware of the corpse of a fox lying at the end of the alley. — 1990