From Wiktionary, the free dictionary
يع • (yaʿ)
- an exclamation of disgust in regards to an offensive odor, taste, sight, or thought: yuck!, ew!, ugh!
Onomatopoeic, ideophonic.
يِعّ • (yiʕʕ)
- an exclamation of disgust in regards to an offensive odor, taste, sight, or thought: yuck!, ew!, ugh!
- ريحَتُه مُقرِفَة يِعّ! ― rīḥatu mugrifa, yiʕʕ! ― it has a bad smell, ew!