Dreams dictionary: Piggyback
Dreams dictionary: Interpretation 1
To dream that you are giving someone a piggyback ride symbolizes your supportive role. You literally feel that you are carrying the weight of others. Perhaps you are feeling overwhelmed of being the responsible or dependent one.
Dreams dictionary: Interpretation 2
To dream that you are riding piggyback on someone represents your lack of power or control in a situation. You are just going along with whatever decisions are being made. Alternatively, being on piggyback points to issues of codependency.