The correct spelling of the word is "most discussing," which is pronounced as /moʊst dɪˈskʌsɪŋ/. The word is composed of the superlative adjective "most," which means "the greatest amount or degree of something," and the present participle verb "discussing," which means "having a conversation about a particular topic." The spelling of the word may be confusing for some, as it is easy to mistakenly spell it as "most discussing" or "most discussed." However, it is important to use the correct spelling to convey the intended meaning accurately.
The word "most discussing" does not seem to have an established etymology. It appears to be a combination of the adjective "most" (meaning greatest in amount, extent, or degree) and the verb "discussing" (present participle form of the verb "discuss"). However, the word itself may not be commonly used or recognized in this particular form, as it seems to be a combination of words that may not typically occur together. It is possible that the intended word is "most discussed", which means the topic or subject that is talked about the most or the one generating the most conversation.