I'm putting my foot down, and I am finally sticking up for myself. 
put foot down 下定决心
stick up for somebody 支持某人，替某人说话
下定决心这个还挺形象的，就脚跺了一下地然后说话。

I'm through with you.
through with somebody 和某人玩完儿了

- I'm kind of getting cold feet here.
- Can you even feel your feet?
get cold feet 突然感到害怕
这是一个固定搭配的口语，表示临阵退缩，想想也挺形象的，害怕的时候是会脚底生凉吧？紧接着Brittney就来一句很不解的，应该感觉不到自己的脚了吧？很有喜感。

Shoot.
说吧。

Ever since you separated from your wife,you've spent a lot of late nights watching reruns of Law and Order, haven't you?  Hmm. Thought so.  And no, I didn't make the Glist.
哈哈哈，本集最佳台词，加上Kurt的那个小表情，笑喷了我了~~~

It's Olivia Newton-John, star of Grease--  the most successful movie musical of all time.
Olivia Newton-John是个乐坛巨星啊，一路转型趟趟成功。这集是她跑来客串的。
 

Nice try.
带有讽刺口味的一句口语，表示“嗯，装的不错”，但是言下之意就是我没上当。

You're aware a tape was leaked onto the Internet,  causing you to become a national laughingstock?
laughingstock 笑柄
 
Let's say we crack open a book, huh? 
crack a book 打开书本学习
通常带有一点消极的意味

I'm supposed to smile and be impressed by how in touch you are with your feelings and moon over the fact that you care about me so much, 
moon over 神魂颠倒 to have a powerful romantic attraction for someone

I can't believe that you're going to pin this on me.
pin on 归咎于某人 Attribute to someone

The moment I felt what it was like to walk in your shoes. 
walk in someone's shoes 换位思考，换到某人的角度来想

They all closed ranks and wouldn't rat out who did it. 
close ranks 团结一致
rat out 出卖，供出
 
I... I just want people to think I'm cool so bad sometimes that it just clouds my judgment. Okay? 
clouds one's judgment 判断力混乱