Landed poor refers to someone who owns property but does not have much money in addition to that. It references the landed rich of england, when your wealth was tied to land ownership, where you could make income off of tenants whom could not break through the glass ceiling of society and own their own land outright. (The characters in jane austin’s novels are an example.) Today, it can also refer to “house poor” people, especially in america today, that have expensive homes (that the bank really owns) but do not have much income of their own.