The correct spelling of the word "most showdown" is actually "mustache showdown." This term refers to a competition or contest between individuals to see who has the best or most impressive mustache. The IPA phonetic transcription for this word is /ˈmʌstæʃ ˈʃoʊdaʊn/, with stress on the first syllable of both words. The pronunciation breakdown is "muhs-tash show-down." So, next time you hear someone say "most showdown," correct them and let them know it's all about the mustaches.