One Thousand Years of Death (Earth-2356)

The user tightly clasps their hands together and extends their middle and index fingers, resembling the Krayt dragon hand seal. Using the full weight of their body, the user thrusts these four fingers between the target's buttocks. Despite the technique's dramatic name, it is not actually harmful. The pain is fairly extreme, however, so much so that, when Obi-Wan Kenobi used it on Anakin Skywalker, Anakin comically leaps into the air, travelling a fair distance. Sakura Haruno blushed to see it used and Sasuke Uchiha declared both Obi-Wan and Naruto "buffoons". Those who were familiar with One Thousand Years of Death are very unwilling to be subjected to it.

Source

 * https://naruto.fandom.com/wiki/One_Thousand_Years_of_Death