bun

1. N-COUNT Buns are small bread rolls. They are sometimes sweet and may contain dried fruit or spices. 小圓面包

...a currant bun. …一塊含葡萄干的小圓面包。

2. N-COUNT If a woman has her hair in a bun, she has fastened it tightly on top of her head or at the back of her head in the shape of a ball. 圓髻

3. N-PLURAL Your buns are your buttocks. 屁股[美國英語] [非正式]

I'd pinch his buns and kiss his neck. 我要擰他的屁股，親他的脖子。