i.e. pother (Hibernian). Halliwell gives us blother, which he says means to chatter idly.
`Sir,' cries the umpire, `cease your pother, The creature's neither one nor t'other.'
Lloyd: The Chameleon.
The Irish bódhar (buaidhirt, trouble), or its cognate verb, to deafen, seems to be the original word.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894