The correct spelling of the phrase "hast notion" is actually "hasn't notion." The "t" in "hasn't" is often silent in casual conversation, leading to confusion about the correct spelling. In IPA phonetic transcription, "hasn't notion" would be written as /hæznt noʊʃən/, with the emphasized syllable being "no". The use of proper spelling is important in clear communication, especially in written form, and can prevent confusion and misinterpretation.