The word "paff" can be spelled as it sounds, but a more accurate representation can be given through the use of IPA phonetic transcription. In IPA, "paff" is spelled /pæf/. The first sound is a voiceless bilabial plosive, represented by the symbol /p/. The second sound is a short vowel similar to the "a" in "cat", represented by /æ/. The final sound is another voiceless bilabial plosive, represented by /f/. So, the correct spelling of "paff" in IPA is /pæf/.