The spelling of the word "most flung" is straightforward when you understand the International Phonetic Alphabet (IPA) phonetic transcription. The IPA symbol for the "o" sound in "most" is /o/, while the symbol for the "u" sound in "flung" is /ʌ/. Therefore, when combined, the IPA transcription for "most flung" is /məʊst flʌŋ/. The word "most flung" is used to describe something that has been thrown the farthest or has traveled the greatest distance.
"Most flung" is not a common phrase or word in English. It appears to be a combination of the superlative form of the adjective "most" and the past participle of the verb "fling". However, "most flung" is not an established term with a specific etymology.