The spelling of the word "most dingdong" can be a bit tricky to understand. The first word, "most," is simple enough, /məʊst/. However, "dingdong" requires a bit more attention. It is spelled /dɪŋ dɒŋ/, with the stress on the first syllable. This word is often used to describe something that is a bit silly or foolish. So, when combined, "most dingdong" could mean something like "very silly" or "extremely foolish." Keep in mind that this is a more colloquial expression and may not be used in formal situations.