대박

daebak

What it means

Awesome, amazing — or a huge hit.

Where it comes from

Origin unclear — there are theories, but none confirmed.

When you'd use it

Reacting to anything impressive, good or (sarcastically) bad.

Example

콘서트 표 구했어? 대박!You got concert tickets? Awesome!

Careful

So common even TV news uses 대박 행진 for a hit; as an exclamation it's still casual.