i do...i was trying to restart it with a guy at college...i remember my dad and my uncle introduced it to me one day...but they had a super long extended version..."chinny reckon jimmy hill scratch my chin porky pie itchy grandad" i don't know what all the end bit is about...but it made me laugh
Basically, whenever somebody says something that is unbelievable, you rub your chin and say one of a variety of phrases, preferably in a silly voice or putting the emphasis on the wrong syllable. The phrases are as follows (I've tried to put the points of emphasis in caps, but it may vary from school to school: Chinny reckON Jimmy 'ill Chin chin
Nah down south it was rubbing your chin and saying "yeaaaa" or "chinny chin chin" or "eeerrrrrrr" (whilst putting your toung between your bottom teeth and lip to make them feel EXTRA dumb)
heard the chin chin one when i was little, i think sal had particulary annoying version anyone remember the classic: rite.................... *long pause and lifts one eyebrow like the rock used to*