You are either
covering your ASS
laughing your ASS off
kicking ASS
kissing ASS
busting ASS
trying to get some ASS
or behaving like an ASS
…. or….
you live with an ASS.
1. ASS
The most common and literal definition of ass is a donkey, and then the human butt/buttocks . It is used in a very literal sense (fall on your ass), and sexually (that guy/girl has a niceass). It can also be a person who is being an inappropriate jerk . Neither of these are formal or polite, but their use is extremely common.
Ass字面意思是驴子，也指人的屁股。一般用于字面意思（比如一屁股坐在地上），也用于挑逗性场景（比如那个男/女孩屁股很性感）。有时候这个词也用来形容那些蠢蛋。当然这两种解释都不适用于正式场合，都显得不礼貌，但是在生活中常常被用到。
Example:
(1) “He tried to kick the ball but missed and fell on his ass.”
他去踢那个球没踢中，结果失足一屁股摔在了地上。
(2) “My friend drank too much and started acting like an ass (or making an ass out of himself)”
我朋友喝醉了，开始发酒疯。
2. Cover Your ASS
To protect yourself or someone else or getting into trouble in a problematic situation (protect yourself from risk),usually within an organization or something related to the law.
替自己或别人擦屁股，掩盖事实，避免受处罚。通常是出现法律纠纷时。
CYA = Cover Your Ass 替你擦屁股
CYOA = Cover Your Own Ass 给你自己擦屁股
Example:
The police officer didn’t want to fill out the report. He only did it to cover his ass so he wouldn’t get in trouble later.
警察不想写报告。他纯粹为了给自己擦屁股，好让自己置身事外。
3.LMAO (Laughing my ASS Off)
The common textspeak (internet/digital acronym) term to describe laugher. Given the fact that the original term for it, LOL (laugh out loud), lost its power with time and overuse, LMAO and LMFAO(Laughing My Fucking Ass Off) became popular for sincere humor. [verb] your ass off is a common generative formation that is used with other verbs too:
比较恰当的解释是，笑的屁滚尿流。非常常见的一种首字母缩略的网络用语，现在越来越流行，用来形容某件事或者人特别搞笑。有点像之前的LOL（开怀大笑），不过已经被用烂了。动词 your ass off是一个非常常用的组合，为了强调或者表示程度重。
Example:
(1) “I worked my ass off last week to pay rent.”
为了付房租，上周我真是拼了老命工作。
(2) “I studied my ass off to pass the test.”
为了考试及格，我真是头悬梁锥刺股地学啊
(3) “I laughed my ass off when he fell on his ass.”
他摔的一刹那，我真是笑得不行。
4. Kiss my ASS
A disrespectful thing to say to someone you are angry at and don’t want to communicate with.
来亲我的屁股表示看不起别人，是一种非常粗鲁的表达。当你非常生气，不想与对方沟通时可能会冲着对方说：Kiss my ass！
Example:
An aggressive driver who is angry at another car might yell kiss my ass out the window.
一个凶悍的司机很生气，透过车窗冲着另外一辆车大喊：Kiss my ass！
5. ASShole
The literal definition of asshole is anus ,but it is most commonly used to call somebody a jerk. This is a bit disrespectful and a profane, but sometimes it is merited. Asshole is more commonly used to describe men, while bitch is the female synonym of this.
字面意思是肛门或“菊花”的意思，但是经常用来形容某人很混蛋。表达有点对别人不尊重和亵渎别人的意思，但是有时候却是对方罪有应得。Asshole通常用来形容男性，而bitch则用来形容女性。
Example:
“The waiter was such an asshole that I decided not to leave a tip.”
这服务生是个混蛋，我决定不给他小费。
6. Bust my ASS / Bust or Rip ASS
(1) to bust your ass is to work very hard(2) to bust or rip ass is to fart (to flatulate), but generally in a loud and probably embarrassing way.
拼命努力工作。还有一个意思是放屁，而且还是特别大声的那种。
Example:
(1) “I busted my ass studying for that test.”
为了考试，我拼了命地学习。
(2) “He busted ass in front of the whole class.”
他在全班面前放了一个超级响的屁，全班沉默了。
7. Get some ASS
Get some ass is to hook up or to have sex. It’s usually used by men (although not always), and is talked about as an achievement. It’s often shortened to “Get some.”简单来说就是约炮的意思。男性使用的较多，成为嘴上谈资。通常缩写为“Get some”。
Example:
“The only reason a lot of people go out is to get some ass.”
很多人出去嗨皮主要是为了约炮。
其他：
JackASS 傻帽
BadASS 坏蛋
DumbASS 傻帽
LazyASS 懒癌症患者
HardASS 难搞的人
SmartASS 机智鬼
Thumb up your ASS 浪费时间
Get Your ASSin Gear 赶紧振作起来！
Your ASS is Mine 你属于我了
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