make a Horlicks of
make a Horlicks of (something)
To ruin, bungle, or spoil something. Primarily heard in UK. I really made a Horlicks of that project at work—I'm going to get fired for sure! I'm afraid the accounting department made a complete Horlicks of these numbers. We'll need to tally the entire ledger again.
make a Horlicks ofmake a mess of. British informal
1988 Joanna Trollope The Choir He thought privately that they would make a fearful horlicks of running the choir.