Sorry, but I think it would be wrong to endure the correct word in the title :).
Ready to kick ass robots? Then meet Shiri.
What it is? Well, in fact, this is a robotic ass, which the author describes as "humanoid buttocks that transmit emotions through the movement of artificial muscles." Buttocks can feel touches, strokes and, of course, slaps (shake immediately at 2:25, if that). ')
The project was carried out at the Japanese University of Electrical Communications, where its author is also working on a hugging robot and a kissing simulator.