Why couldn't you just come up with a better lie?你怎么就不想個更好的借口？

come up with:提出, 想出

The programmer come up with a solution to the system problem.

程序員想出了一個解決系統問題的辦法。

He could not come up with a proper answer.

他想不出一個合適的回答。

It was like my mouth was talking before my brain could catch up.我腦子還沒轉過來就脫口而出了.

catch up:趕上

He walked too slowly to catch up with me.

他走得太慢而不能跟上我。

We have done all we could to catch up with them.

我們已經盡了一切可能來趕上他們。

You can make fun of me all you want,你可以盡情取笑我

make fun of:取笑, 拿 ... 開玩笑

He was often made fun of for his strong accent.

由于他鄉音很重，大家常和他開玩笑。

In general, people don't like to be made fun of.

大體上講，人們都不喜歡被捉弄。