Most famously featured on the show, iCarly, a hob knocker is a word mainly used by English people. In real definition, a hob knocker is a man, during oral sex, hitting a woman in the face with his dick
On iCarly, it is described as illegal. In actuality, it isn't. It's just really fun
Filmer: Hey, Joe! Be a hob knocker and whack the slut with your dick!