This phrase is used in Ireland (Hiberno English).
It means to make a mess of something. Interestingly enough, everyone in Ireland knows what this phrase means but very few actually know what a hames actually is.
Note: The word hames is pronounced to rhyme with games and names.
I made a complete hames of my exam today, I definitely won't pass.
The first time I tried to make sushi I made an absolute hames of it, but I'm much better now.
Wow, the hairdresser really made a hames of your bangs, you should have demanded a refund.
I had to look up the origin of the term hames.
Seemingly a hames is an object you secure on a horse to help carry a load of goods. When the hames is poorly secured then the load can easily all fall off which of course would be a bit of a disaster.