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anus balls big_butt bodily_fluids butt butt_slap debudraws genitals grey_background grin grinning_at_viewer hi_res looking_at_viewer looking_back mad_rat_(mad_rat_dead)mad_rat_dead male mammal motion_lines murid murine nippon_ichi_software rat rodent simple_background slap slapping_own_butt slapping_self smacking_ass smile smiling_at_viewer solo sweat sweaty_balls sweaty_butt sweaty_genitalia tail twerking