noun
go-home club; students not in any club
Jocular term for students who go straight home after school instead of joining a club activity. Often used self-deprecatingly or humorously. Compare 幽霊部員 (ghost member).
See also: 幽霊部員
高校時代はずっと帰宅部だった。
I was in the go-home club all through high school.
帰宅部の僕は放課後すぐに家
As a go-home club member, I go straight home after school.
Compound of 帰宅 (going home) and 部 (club), coined as a humorous pseudo-club name for students who do not participate in extracurricular activities.