drinking at home (instead of going out); a casual term for having drinks at one's house
週末は外に行かずに家飲みを楽しんだ。
I enjoyed drinking at home over the weekend instead of going out.
最近は友だちと家飲みをすることが多い。
Lately I often have drinks at friends' houses.
家飲みだとコストを抑えられるし、リラックスできる。
Drinking at home cuts costs and is more relaxing.