"Bally gum" is a slang term used mainly in Ireland and the UK to refer to nonsense or foolish talk. The spelling of this word can be explained by using the IPA phonetic transcription. The first syllable "bal-" is pronounced as [bæl], rhyming with "gal". The second syllable "-ly" is pronounced as [li], similar to the word "lee". The final syllable "-gum" is pronounced as [gʌm], similar to the word "gum". Therefore, the whole word is pronounced as [ˈbæli ˌgʌm].