![1boy 1girl ahegao animal_ears artoria_pendragon_(all) artoria_pendragon_(swimsuit_ruler)_(fate) ass bangs blue_legwear blush bouncing_breasts breasts bunny_girl censored cowgirl_position cropped_jacket crown fake_animal_ears fate/grand_order fate_(series) from_behind green_eyes hair_between_eyes head_back heart_pasties hetero large_breasts long_hair long_sleeves meme_attire nanaya_(daaijianglin) open_mouth pasties penis revealing_clothes reverse_bunnysuit reverse_outfit saliva sex sidelocks spread_legs straddling thighhighs tongue tongue_out vaginal rating:e score:27 post #3829466](/cdn_image/preview/50/29/5029d30058cad94fc62dda6944602e77.jpg)
A "bunny girl" generally refers to a Japanese term given to a Playboy bunny, especially one who wears a bunnysuit.
But some images having this tag do not refer to the Playboy bunny, but simply a female human or anthromorph having rabbit ears, but not necessarily the other elements of the Playboy bunny.