The word "dost as says" is likely a regional variation of the phrase "does it say." The spelling is unusual, but it can be phonetically transcribed as /dʌst əs seɪz/. The silent "t" in "dost" is a relic of archaic English, when the word was pronounced with a "t" sound. This spelling may be specific to certain dialects or accents, and it might not be considered standard English. Nonetheless, it is a fascinating example of the diversity of the English language.