The spelling of "more dirtydealing" is based on its pronunciation. The word "dirty" is pronounced with the /ɜːr/ vowel sound, followed by the /t/ and /i/ sounds. Similarly, "dealing" is pronounced with the /i/ sound, followed by the /l/ and /ɪŋ/ sounds. When combined, the two words form "dirtydealing". Adding "more" in front of it indicates a higher degree of this behavior. So, the correct spelling of this word is "more dirtydealing" /mɔːr ˈdɜːrtiːdiːlɪŋ/, with emphasis on the second syllable of "dirtydealing".