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 mirco-bombs' detonation causes the victims' bodies to disintegrate at the cellular level; literally turning them into dust. While fighting Ōnoki, Deidara utilise an alternate method of C4 by forming a small, chibi-like clay statue of himself with the mouths in his hands.

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. It is so stable that only a blasting cap will detonate it, if lit on fire it will not explode (it will burn at a very high temperature) and can safely be used for cooking (though this is by no means a recommended action).
 * is the Japanese Buddhist equivalent of Garuda, a bird man of Hindu mythology who feeds on serpents.