BOLLIX
botch, bodge, bumble, fumble, botch up, muff, blow, flub, screw up, ball up, spoil, muck up, bungle, fluff, bollix, bollix up, bollocks, bollocks up, bobble, mishandle, louse up, foul up, mess up, fuck up
(verb) 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”
Source: WordNet® 3.1
Etymology
Verb
bollix (third-person singular simple present bollixes, present participle bollixing, simple past and past participle bollixed)
(transitive) To confuse.
(transitive) To botch or bungle.
Noun
bollix
confusion
mess
Source: Wiktionary