屁股的英文：
buttocks
bottom
arse
end
butt

参考例句：

My sitter is sore from sitting.
我的屁股都坐痛了。

Now get your fanny off that stool.
现在，把屁股移开椅子。

I butt called my mum by accident.
我不小心给妈妈打了通屁股电话

He gave the boy a spank.
他打了那个男孩屁股一下。

The boys went swimming in the nude.
男孩们光着屁股去游泳。

She slapped the waiter after his soft carass on her bottom.
她扇了摸她屁股的服务员一巴掌。

She slapped the waiter after his soft carass on her bottom.
她扇了摸她屁股的服务员一巴掌。

If you're naughty, mother will spank you
你如果淘气,妈妈就会打你屁股的。

If you're naughty, mother will spank you.
你要是调皮，妈妈会打你屁股的。

Why did your dad spank you?
你老爸为什么打你屁股呢？

buttocks是什么意思：
n. 臀部；船尾
v. 背摔

The back section of the buttock on the outside may be sensitive to the touch.
这块肌肉在臀部后面外侧的部分，可以很容易就摸到。

He buttocked his opponent onto the mat.
他把对手背摔在垫子上。

Armor consisting of overlapping plates used to protect the buttocks
护臀甲由相互交迭的甲片构成的铠甲，用来保护臀部

bottom是什么意思：
n. 底部；末端；尽头；臀部
adj. 底部的
v. 装底；建立基础；到达底部

reach the bottom
到达底部

Get to the bottom of
弄个水落石出

Look, the bottom is bubbly!
看，鞋底有有很多泡泡呢！

arse是什么意思：
n. 屁股；笨蛋，饭桶
v. 闲混

Oh, and Hayes sucks arse!
哦，海耶斯太差劲了！

Get off your arse!
别闲坐着！

I feel like a perfect arse!
我觉得自己就像个饭桶！