I've really messed up this time.

这次我真的把事情给弄糟了。

《牛津词典》

B: He really messed up this time.

他这次真的是搞砸了。

youdao

I'm sorry, I really messed up last time.

对不起，上次我把事情搞砸了。

youdao

And so, even by units analysis, if the units come out right, you've got a good shot that unless you've really, really messed up, that the answer is going to be right.

甚至在单位分析中，如果你的单位正确，你就能做的很有条理否则会一团糟，而注意了单位你的答案才有可能正确。

麻省理工公开课 - 固态化学导论课程节选

It was really good. A really sad ending or a messed up ending, I mean... it's kind of a mind-bender.

很不错呀。结局真的让人意想不到，非常震撼。

和英文专业的朋友 - SpeakingMax英语口语达人

So, the hope is that we really messed up this time, and like with any new financial instrument, we'll learn how to be grownups down the road.

NPR: Listeners' Money Questions Answered

Despite having missed out in play-offs at the 1994 US Open and 1995 USPGA, the Scot said that was the only tournament where he "really messed up".

BBC: Colin Montgomerie wins Sports Personality coach award