Pronunciation: [mˈə͡ʊst mˈʌt͡ʃə͡ʊ] (IPA) 
The correct spelling of the phrase "most mucho" is actually "muy macho." This phrase, which translates to "very manly," comes from Spanish. In IPA phonetic transcription, "muy" is pronounced as /müi/, with the emphasis on the first syllable, and "macho" is pronounced as /mätʃoʊ/, with the emphasis on the second syllable. Although "most mucho" may sound similar, it is not the correct spelling or pronunciation of the phrase.
The phrase "most mucho" is actually a combination of two words from different languages: "most" from English and "mucho" from Spanish.
The word "most" in English is a superlative form of "much". It is derived from the Old English word "māst", which means "greatest" or "biggest". The word "much" itself has Middle English and Old English roots, ultimately stemming from the Proto-Germanic word "*mikilaz", meaning "great" or "large".
On the other hand, "mucho" is a Spanish word that means "much" or "a lot". It is derived from the Latin word "multum", with similar meanings. "Multum" eventually evolved into "mucho" in Spanish, emphasizing quantity or magnitude.
