pre mary whitehouse experience, at our school we had "chin on", "chinner!", "itchy chin" and then "itchy chin, jimmy hill" when the person was seriously talking out of their ring. also, people would pretend to pour salt on their chin as well. apparently that made your chin grow.
jimmy hill - well he is famous for talking pony.
we also had "spin on" and "spinner" (both often accompanied by a circular waving of the hand/arm) all at the same time as the chin phenomenon and well before the idea of putting political spin on a story. man, we were so ahead of our time down in the sticks. and what a lexicon!
my favourite was "choice!" when you were told to do something you didnt want to do. the temptation to use this is still great, especially in a work/corporate environment.
shame all the above arent still in common parlance, especially in the grown-up world.
Paxman: So what do you say to the minister's comments, dr smith?
Dr smith: With all due respect, I say itchy chin, jimmy hill. spin on, you doomer! [pours imaginary salt on his chin while spinning his free arm round and round]
Paxman: Quite. Now over to kirsty with news of the earthquake in Japan
Kirsty: Choice!