Boin Boin no Mi

The Boin Boin no Mi is a Paramecia-type that allows the user to turn their limbs into springs, making the user a Spring Human (バネ人間).

Etymology

 * "Boin" comes form "Boingu" which mean Boing in Japanese.
 * It is called the Boing-Boing Fruit in the Manga, the sound effect that springs make.
 * It is called the Spring-Spring Fruit in the dub.