The spelling of the word "RETPMAN" can be explained using International Phonetic Alphabet (IPA) transcription. The first syllable, "RET," is pronounced as /rɛt/, with a short "e" sound followed by a "t" sound. The second syllable, "PM," is pronounced as /piːɛm/ with a long "i" sound and the "m" sound at the end. Therefore, "RETPMAN" is pronounced as /rɛtpiːɛmæn/. While the meaning of "RETPMAN" is unclear, the IPA transcription can help in understanding its spelling and pronunciation.