In this scene, Max asks Liesel to describe the day outside for him. After a simple explanation fails to sate him, he tells Liesel to "make the words [hers]". Liesel describes the day poetically, and Max is satisfied with her description.
This quote comes from the part in the book when Rudy asks Liesel why she is stealing the books. Liesel responds by telling him, "When life robs you, sometimes, you have to rob it back.