—OK, your total comes to $65.90. 好的，一共是65.9美元。
—What!? I only bought some cheese. 什么，我只买了些奶酪。
—Oh, sorry! $6.59...I goofed up. 哦，对不起，我搞错了。

I goofed up. =I messed up./I screwed up. 我弄错了。

You're such a screw up. You never do anything right. 你这是一个破坏大王。你从来没有做对什么事情过。
Sorry, I was out of it. 抱歉，我弄错了。
Sorry, I was in la la land. 抱歉，我弄错了。