The correct spelling of the phrase "doeth the top of head" is actually "off the top of my head". The mistake in spelling may be due to mishearing or misunderstanding the phrase. In IPA phonetic transcription, the correct pronunciation of "off" is /ɒf/ and "the" is /ðə/. "Top" is pronounced as /tɒp/ and "my" is pronounced as /maɪ/. "Head" is pronounced as /hɛd/. Overall, the correct spelling and pronunciation help convey the intended meaning of the phrase.