子こ供ども部屋べやおじさん

noun

adult man still living in his childhood room at his parents' house

Internet slang, derogatory. Refers to an unmarried man, typically over 30, who continues to live in his parents' home, often in the same room he had as a child, implying a lack of independence or social maturity.

• 彼かれは四よん十じゅっ歳さいだけど、まだ子こ供ども部屋べやおじさんだ。

  He's forty, but he's still a guy living in his childhood room at his parents' place.

• ネットでは子こ供ども部屋べやおじさんがよくネタにされる。

  On the internet, 'kodomobeya-ojisan' is often made fun of.