What is the dream that lennie begs george to tell him? What does lennie mean by the phrase "an live off the fatta the lan"?

George's monologue to Lennie is always similar, With [George and Lennie] it ain't like that." He and Lennie have found companionship; they watch out for one another. And beyond that, they have a dream of finding a fixed place they could call home, a farm of their own. They are doing what they can to resist sinking into miserable loneliness, which seems to be the lot of so many other itinerant workers. Their dream is a farm where they can live off what they grow (fatta the lan) and Lenny can tend the rabbits.