Buggered it up
To make a major mistake during an activity such as cooking, or in the creation of something like a work of art etc. The words can also be used to indicate a serious detrimental condition that has contributed to a breakdown or termination of a relationship.
Hey Baz how's your love life with Nadene? Cool?
No man she's sick of me. I got caught by her in bed with her best friend! It was a stupid drunken thing! I've made such a stupid mistake. We had such a good relationship goin' I've really buggered it up!
No man she's sick of me. I got caught by her in bed with her best friend! It was a stupid drunken thing! I've made such a stupid mistake. We had such a good relationship goin' I've really buggered it up!
bugger it up
break it, ruin it, spoil it or damage it in some way
Don't lend him anything of value. He'll just bugger it up. He's got the Shitters Touch.