Colloquial variant 엉 is common in speech. Colloquial variant 엉 is common in speech. Drawn-out 으응 is a common colloquial spelling. Colloquial variant 엉 is common in speech. Colloquial variant 엉 is common in speech. Drawn-out 으응 is a common colloquial spelling. Casual/cute variant 옹 is common in speech and messaging.