noun
lunchbox lovingly made by one's wife
A bento prepared by a wife for her husband, often with care and affection. Can be used humorously or enviously by others.
彼は毎日、奥さんの愛妻弁当を持って会社に行く。
He goes to work every day with a lovingly made lunchbox from his wife.
弁当 is a general term for a packed meal or lunchbox, while 愛妻弁当 specifically refers to one made by a wife with affection.
Compound of 愛妻 (aisai, 'beloved wife') and 弁当 (bentō, 'packed meal').