What is Rut-tut-tut?
1.
1. The catchphrase of the two switch maestro penguins in their advert.
2. The last, vain attempt to get a laugh once a joke has gone flat. Usually unsuccessful.
1."Dum-dum-dum-da-dum, Rut-tut-tut."
2. "and then the French guy says 'deoderant, what's that?'. Heheh (awkward silence). Umm.. rut-tut-tut?"