Congrats jono and thanks mattrom.
I've heard "the cat's pyjamas", but never "the cat's meow" in that sense.
In one edition of Douglas Adams's
The meaning of liff (not to the one I have to hand, unfortunately), I think he defines "Ebsworth" as "the distance from which sheep appear attractive". He then adds that the original line from
Gone with the wind was "Frankly, my dear, I don't give an ebsworth", but this was changed for US audiences...