"Dost a bit" is a phrase commonly used in British English meaning "do you want a little bit?" The correct spelling should be "d'yeosstabit." In IPA phonetic transcription, it would be pronounced as /dʌjəʊsəbɪt/. The word "d'ye" is a contracted form of "do you," and "osstabit" is a truncated version of "you want a bit." The unique spelling of this phrase reflects the accent and dialect of the British English language.