Definition of cat melodeon in English:

cat melodeon

adjective

Northern Irish
informal
  • Extremely bad or unpleasant; awful.

    ‘putting them on directly before us was absolutely cat melodeon altogether’
    • ‘It's cat melodeon and hard to watch.’
    • ‘I thought that Pierce was kind of handsome for his age, in an old hippy sort of way, but my friend said that he was pure cat.’
    • ‘The big red logo is cat melodeon.’
    • ‘Today is my birthday, and the highlight so far has been going to the shops to buy dinner in this cat melodeon, rotten rain.’
    • ‘I think it's cat, round here.’

Origin

1980s: possibly from Irish cat marbh ‘mischief, calamity’, or an abbreviation of catastrophe + melodeon; or perhaps from a comparison between the sound of a melodeon and that of a cat wailing.

Pronunciation

cat melodeon

/ˈkat mɪˌləʊdɪən/