第一个句子: I am maxed out.我累惨了!
maxed out=tired out=worn out
max可以联想到最大值,（min最小值）所以maxed out当然表示累到了极点
第二个句子: I have got to catch some Zs!我要休息一会儿!
to catch some Zs:休息一会儿
Since we are maxed out, we have got to catch some Zs.
Z:联想——>卡通片中卡通人物在睡觉的时候,不就是用英文字母Z表示吗?
外国人想象力倒还挺丰富的哟!
I am maxed out now, so I have got to catch some Zs!
Are you maxed out? Just go and catch some Zs!
Remember:Health is wealth!
来源：无忧考网-英语口语 http://www.51test.net/yyky
