The phrase "makes up off top of head" is a common expression meaning to come up with something quickly and without much thought or preparation. The spelling is somewhat tricky, as "makes up" is fairly straightforward while "off top of head" requires a more nuanced approach. The IPA transcription would be /meɪks ʌp ɒf tɒp əv hɛd/. The "o" in "off" is pronounced with a short "o" sound, and the "f" in "of" is pronounced with a softer "v" sound due to the following "v" sound in "top."
"Making up off the top of one's head" is an idiomatic expression that refers to the act of formulating or creating something quickly or spontaneously without any prior thought or preparation. It is commonly used in situations where someone is expected to give an immediate response or come up with a solution or explanation on the spot, without having the opportunity to gather relevant information or think deeply about the topic.
The phrase typically implies that the response or information provided may not be entirely accurate, reliable, or well-thought-out, as it is generated purely from one's existing knowledge or intuition without any research or contemplation. It suggests that the person is relying on their ability to think quickly, draw upon their general knowledge or experiences, and present an answer without significant consideration.
"Making up off the top of one's head" is often used in casual conversations, informal settings, or spontaneous situations where precision or accuracy may not be of utmost importance. It acknowledges that the reply may be a rough estimate, guess, or assumption, and sets the expectation that the information should not be considered definitive or final without further verification or investigation.