hafu-hafu
The sound of puffing air while eating something too hot — biting into a steaming nikuman or freshly fried croquette.
💡Eating a hot meat bun — 'She was hafu-hafu eating the nikuman!'
肉まんをはふはふしながら食べた。
I ate the meat bun hafu-hafu.
The gratin was so hot, I ate it ___ blowing on each bite.
グラタンが熱くて○○しながら食べた。