The spelling of "didst top your head" is unique due to the archaic language used. "Didst" is the past tense of "do," with the "-st" ending denoting the second-person singular form. "Top" is a verb meaning to cut or remove the top portion of something. The pronunciation can be written in IPA phonetic transcription as /dɪdst tɒp jɔːr hɛd/. This phrase may be unfamiliar to many modern readers, but it provides a glimpse into older forms of English usage.