C4

A technique he created to counter the Sharingan and the genjutsu it produces, Deidara uses his own mouth instead of the ones on his hands to create a giant doll in his image. When the doll ruptures, it releases a cloud of microscopic bombs that enter the bloodstream of anyone who inhales them. On Deidara's command, the micro-bombs' detonation causes the victims' bodies to disintegrate at the cellular level; literally turning them into dust. While fighting Ōnoki, Deidara utilises an alternate method of C4 by forming a small, chibi-like clay statue of himself with the mouths in his hands. This technique also earned enough credit to be called a fearsome technique by such a powerful shinobi as Obito Uchiha.

Trivia

 * "C-4", also known as Composition C-4. is the latest of the Composition C plastic explosives that has been used since the 1950s due to its effectiveness.
 * is the Japanese Buddhist equivalent of Garuda, a bird man of Hindu mythology who feeds on serpents.
 * It was called Giganto Deidara by Obito while in his Tobi guise. It was meant to just be a fun name showing Obito's fake Tobi personality.