The word "booingest" is a superlative form of the verb "boo", commonly used to express disapproval or protest. The IPA phonetic transcription for this word is /ˈbu.ɪŋ.əst/, where the first syllable is pronounced as "boo" with the long vowel sound /u:/ and the second syllable is pronounced as "ing" with the /ɪŋ/ sound. The "-est" suffix is added to indicate the highest degree of booing. Although not a common word, it can be used for emphasis when describing a particularly negative reaction.