Soandso is a colloquial term used to refer to an unknown or unnamed person. The spelling of this word is based on its pronunciation, which is /soʊ ənd soʊ/. The first syllable is pronounced as "so" with a long 'o' sound, the second syllable is pronounced as "and" with a schwa sound, and the final syllable is pronounced as "so" with a long 'o' sound. The term "soandso" is commonly used in spoken language but is not considered standard English.