Make a hash of something
Definition 1 of 1
Pro Tip 1/3Negative Outcome
Use when something ends poorly due to mistakes or incompetence. 
She made a hash of her driving test by running a red light.
Pro Tip 2/3Casual Speech
Commonly used in informal situations among friends or in casual conversation. 
The team made a hash of the whole game last night.
Pro Tip 3/3Avoid Blame
Don't use the phrase to accuse someone directly, as it can seem confrontational. 
I think we both know that someone made a hash of the budget report.