The phrase "doth off the top your head" is not a commonly used expression in modern English, but its meaning involves recalling something from memory without much effort. The correct spelling of "doth" (meaning "does") can be explained in IPA phonetic transcription as /dʌð/, with the ð symbol representing the voiced dental fricative sound found in the word "this." The phrase's use of "off the top" and "your head" is more straightforward, with their IPA symbols being /ɒf ðə tɒp/ and /jɔːr hɛd/, respectively.
"Doth off the top your head" is an idiomatic expression derived from Shakespearean English, specifically the use of the third person singular present tense form of the verb "doth" to indicate an action performed by someone other than the speaker. The phrase "off the top of your head" is a more modern idiom used to describe spontaneous or immediate responses or thoughts without much prior consideration or research.
When combined, the phrase "doth off the top your head" implies someone else giving a quick response or answer without taking much time to think or deliberate upon it. It suggests that the response is provided instinctively or intuitively without consulting any external sources or references.
Importantly, this phrase is often used humorously or in a somewhat lighthearted context, highlighting the informality or lack of thoroughness in the response. It can also convey a sense of spontaneity or creative thinking that may not yield the most accurate or well-thought-out answer.
Overall, "doth off the top your head" refers to someone providing a quick, improvised response without much consideration, drawing on their immediate knowledge or instincts rather than relying on careful analysis or research.