The spelling of the phrase "lump of spit" can be broken down using the International Phonetic Alphabet (IPA) as /lʌmp əv spɪt/. The "u" in "lump" is pronounced as a short "uh" sound, followed by the "mp" consonant blend. The "of" is pronounced with the "v" being almost silent, and the "spit" begins with a short "i" sound and ends with a "t" consonant sound. The phrase, while not the most pleasant, showcases the importance of understanding the spelling and pronunciation of different words in language.