hand on own butt

A character with one or more of their hands resting on, pinching, squeezing, grabbing, or holding one or both of their own buttocks.

holding butt — usually involves two hands, lifting one or both butt cheeks, or cupping one or both buttocks from the sides or bottom.
butt grab — a forceful clutching of the butt cheek(s), the character's fingers will squish the butt, and often sink into it.
butt slap — sharp, forceful, open palmed strike to the butt, sometimes causing divots or ripples in characters with particularly fatty buttocks.
spreading/spread butt — using one or both hands to move their butt cheeks to expose the genitals and anus.