Balls up

He was putting everything he had into it, but he kept ballsing up.

'We just have to get through without ballsing up

He really ballsed up that paint work. It'll have to be redone!

It has got to the ludicrous stage that whenever Snedden makes a speech without actually ballsing something up irrevocably, they tell him he's the greatest thing since Winston Churchill;

Bearing in mind that if you're teasing but you have to explain it, then you're not teasing, you're just ballsing things up and being a fucking thug.

We’re humans, we’re fallible, there is no medal for being right all the time; admitting we ballsed it up is not a weakness, it’s a superpower.