The spelling of the word "gigaboo" can be explained using IPA phonetic transcription. The word is pronounced as /ˈɡɪɡəbu/, with the emphasis on the second syllable. The "giga" part is pronounced with a hard "g" sound, as in "goat," followed by a short "i" sound as in "pin" and a stressed "ga" sound, rhyming with "pa." The last syllable, "boo," is pronounced as a short "u" sound, as in "put." Therefore, "gigaboo" is spelled with a "g," two "g's," and a "u."