The spelling of the phrase "most cross sexual" is influenced by its pronunciation, which is /moʊst krɔs sɛkʃuəl/. The word "most" is spelled in its usual form, while "cross" uses the double 's' to indicate its /s/ sound. "Sexual" is spelled with a 'sh' sound indicated by the 'c' and 's' together, while the final '-ual' part is pronounced as /-wəl/. Together, the phrase means the most mixed or varied in terms of sexuality.