The word "prostibulous" is not recognised by standard dictionaries, and appears to be a neologism or a variation of the word "prostitute". Nevertheless, we can break down the spelling according to IPA phonetic transcription: /prɒsˈtɪbjʊləs/. The first syllable is pronounced with a short 'o' sound, and the second syllable with a short 'i'. The 'j' sound following the 't' comes from the letter 'b' which, when cosonantally adjacent to 'j', takes on the 'j' sound. The final syllable ends with a schwa sound followed by the letter 's'.