noun
man who makes his own lunch to take to work
Colloquial term for a man, often a young office worker, who prepares his own bento instead of buying lunch or having someone make it for him. Implies a degree of domesticity and frugality.
最近、弁当男子が増えているらしい。
Apparently, the number of men who make their own lunch is increasing lately.
彼は毎朝早起きして弁当を作る、いわゆる弁当男子だ。
He gets up early every morning to make his lunch; he's what you'd call a bento-making guy.
Compound of 弁当 (bento, boxed lunch) and 男子 (danshi, young man). A modern colloquial coinage reflecting changing gender roles and economic awareness.