2016, Jussi Adler-Olsen, The Alphabet House, page 86:
Kröner sat down heavily, staring at Petra's retreating bottom with its fluttering white bow as she finally continued her rounds, “Lovely bumbum, isn't it, Herr Standartenführer?” he said, addressing James.
2022, Charles Dennis, “No More Lugosi”, in There's a Body in the Window Seat, page 45:
Jonathan lies atop Mortimer, who falls backward to the floor. (Martha asks: "Did you hurt your bum-bum, dear?")
2023 April 4 (last accessed), Flying Alone, MMORPG: Rebirth of the Legendary Guardian 7 Anthology:
"Little Yan Er. It's no good sitting on a boney dragon. You will hurt your little flat bum bum!"