The word "billyho" is pronounced as /ˈbɪli.hoʊ/. The first syllable "bil" is pronounced as "bil" with a short "i" vowel sound, followed by the second syllable "ly" pronounced as "lee" with a long "ee" vowel sound. The final syllable "ho" is pronounced as "hoh" with a short "o" vowel sound. The spelling of this word may seem unconventional, but it's likely derived from common English expressions such as "ho there" or "hey-ho". The pronunciation of the word may vary depending on regional accents.
There is no well-documented etymology available for the word "billyho". It appears to be a slang term that is not widely recognized or used.