The spelling of the phrase "wast mean with" can be explained through the International Phonetic Alphabet (IPA). "Wast" is pronounced /wɑːst/, with the "a" having a longer sound than in the word "cat". "Mean" is pronounced /miːn/, with a long "e" sound. "With" is pronounced /wɪθ/, with a short "i" sound like in "sit" and a "th" sound like in "think". Together, the phrase means "you were ungenerous with". It is important to pay attention to spelling and pronunciation in written and spoken communication.