The correct spelling of the word "hast seat" is actually "has seat". The use of "hast" is an archaic form of the word "has" and is no longer commonly used in modern English. The correct pronunciation is /hæs sit/, with the first syllable rhyming with "mass" and the second syllable rhyming with "neat." The word "seat" is pronounced /sit/ with a short "e" sound. So, the correct pronunciation of "has seat" would be /hæs sit/.