An exclamation encompassing countless meanings and uses, most commonly used when someone is confused and/or unable to hear something. Uttered in a high-pitched shriek, making it extremely irritating.
Particularly preferred by 21-year-old Singaporean girls who also enjoy shouting "Hoah!" at wrong times and peeking through people's cards while playing Bridge, the world's best card game.
Yap/Sam/Winston: HAHAHAH Why did you do that? Your card sucks!
Winston: Huh what huh...
Kacey: *starts peeking through Wincy's cards*