What does "shucks" mean?
"Shucks" is an expression used to convey embarrassment, shyness, or disappointment. The speaker here has used it to indicate her disappointment that she doesn't have the correct change, although we can tell based on her facial expression that she is not actually disappointed. Ex: Shucks, the basketball didn't go in. A related expression is "aw, shucks," which is often used when one receives a compliment. Ex: A: You're so beautiful! You look like a model. B: Aw, shucks. Stop it.