Idiom

죽이 맞다

jugi matda

To get along really well, hitting it off with someone

서로 성격이나 취향이 잘 맞아 즐겁게 어울린다는 뜻

둘이 만나기만 하면 죽이 잘 맞아서 계속 웃어.

Whenever those two meet, they get along so well and keep laughing.