When to use snowball fight in Korean
Korean: 눈싸움[ nun-ssa-um ]

When to use it
눈싸움 usually means a staring contest: two people look at each other and try not to look away first. It is a casual, playful word, and people also use it when two people silently stare at each other because of tension. Be careful: in some situations, 눈싸움 can also mean a snowball fight, so the context is important.
Example sentences
집에서 동생하고 눈싸움을 했어요.
I had a staring contest with my younger sibling at home.
쉬는 시간에 친구들이 눈싸움을 했어요.
My friends had a staring contest during break time.
공원에서 우리 둘이 눈싸움을 했어요.
The two of us had a staring contest at the park.
아무 말 없이 잠깐 눈싸움을 했어요.
We had a short staring contest without saying anything.
가게에서 점원하고 눈싸움이 됐어요.
I ended up in a staring contest with the store clerk.
지하철에서 모르는 사람과 눈싸움을 했어요.
I had a staring contest with a stranger on the subway.