Mbo, in Hardiman's family, it's pur-ka-pur-ka-pur, either to mean what you described above or to say something that you're pretty sure will get that response...

We'll have to watch and see if these become standard Mudcat Threadlingo!

If so, then we could also have:

CatMutterings

CatMuds

CatMouth

LargeMouth Cats

~S~