The word "wast a guest" is an outdated phrase that comes from Middle English. It is spelled with a "w" sound at the beginning, followed by "a" pronounced as in "cat", and then the word "guest", as we use it today. In IPA phonetic transcription, it is written as /wɑst ə ɡɛst/. This phrase means "were a guest" and was commonly used in older forms of English, but is not seen in modern usage.