Said first by Karl Pilkington- a fantastic idiot with a head like an orange- in conversation on The Ricky Gervais Show podcast about 'I'm a celebrity get me out of here' and a celebrity eating a kangaroo penis.
Ricky: "So what're you saying??"
Karl: "I'm saying...I could eat a knob at night."
To be so hungry that if a duck were to fly over you quite close to your head you would reach up and take a bite of the duck's crutch in order to ease your hunger pains.