I have been a bit busy recently; too busy to give this website the attention it warrants. In fact, I said to myself yesterday, I have been running around like a blue-arsed fly.
I stopped to think: why a blue-arsed fly? Is there such a creature? There are many things called red-headed, red-tailed, red-legged, red-breasted and so on, but none I have heard of named for the colour of their posterior.
In any case, why would one "run around" like a fly of any sort?
Can anyone shed some light on the matter?