I assume that you are asking about the part in this chapter where Whit is talking about going in to town and visiting a whorehouse. This is the part where he talks about the two whorehouses in town and compares them. When Whit talks about that, George says he does not want to go because he does not want to waste the money.
Each time that Whit talks about going into town, George replies by saying that he and Lennie are trying to "roll up a stake." By that, he means that they are trying to save money to buy that farm that the two of them dream of owning.
To me, this shows that George is dedicated to the idea of the dream that he and Lennie share. He would rather defer pleasure now so that he can have a better chance at the future that the two of them want.