국룰

gungnul

What it means

The unwritten rule everyone follows.

Where it comes from

Short for 국민 룰 (the nation's rule).

When you'd use it

Ramyeon after swimming, chicken during the World Cup — things that “must” go together.

Example

비 오는 날엔 파전이 국룰이지.Pancakes on a rainy day — that's the rule.

Careful

Casual — fine with friends, out of place in formal writing or with your boss.