It's bollix and leading with the knee is incredibly dangerous.
From the guardian.co.uk
It was also hoped that the raids might counter any plans on Hanoi's part to bollix the summit.
From the time.com
Whether it's distorted or complete bollix is open to debate.
From the guardian.co.uk
Turner Prize awarded to unspeakably pretentious bollix.
From the guardian.co.uk
These bollix up the microbe's machinery.
From the businessweek.com
More examples
Botch: make a mess of, destroy or ruin; "I botched the dinner and we had to eat out"; "the pianist screwed up the difficult passage in the second movement"