Piggybacking may refer to: Piggy-back (transportation), something that's riding on the back of something else Autorack, transporting cars on trains Piggybacking (security), occurs when an authorized person allows (intentionally or unintentionally) others to pass through a secure door, negating the purpose of an access control system such as keypad, pass card or biometric identification scanner Splash cymbal piggybacking, mounting a cymbal on top of an already stand mounted cymbal Seasoned tra… (More on Piggyback)