The spelling of the word "most caveman" can be explained using IPA phonetic transcription. The first syllable "most" is pronounced as /məʊst/ with the vowel sound represented by the symbol /ə/ and the "o" sound represented by the symbol /əʊ/. The second syllable "caveman" is pronounced as /ˈkeɪvmən/ with the "a" sound represented by the symbol /eɪ/ and the "v" sound represented by the symbol /v/. Overall, the spelling accurately represents the pronunciation of the word "most caveman."
The phrase "most caveman" does not have a specific etymology as it is not a widely used or recognized term. "Caveman" typically refers to a prehistoric human who lived in caves, and "most" simply means "the majority" or "the greatest amount". However, if you are referring to the phrase "The most caveman thing ever", its etymology would be a combination of the superlative adjective "most", the term "caveman", and the colloquial use of "thing" to refer to an action or behavior.