noun
Derogatory slang for a person who withdraws from society, typically staying in their room. Abbreviation of 引きこもり.
See also: 引きこもり
あいつ、ずっと部屋から出てこないヒッキーだよ。
That guy is a total shut-in who never comes out of his room.
ヒッキー生活を送っていると、社会復帰が難しくなる。
If you live as a hikikomori, it becomes hard to reintegrate into society.