The term "boosed" is a non-standard word that is not commonly used in everyday language. However, it can be spelled phonetically as "buːst", with the "oo" representing the long "u" sound, and the "st" representing the standard ending of a past participle. The pronunciation of the word is similar to "boosted", but with a more drawn-out and elongated sound. Overall, while "boosed" may not be a widely recognized or commonly used term, its spelling can be explained through its phonetic breakdown.