The word "bolloxes up" is a colloquial term typically used to describe a situation where something has been messed up or gone wrong. There are a number of synonyms that can be used to convey a similar meaning. Some of the most common include: flub, blunder, botch, mangle, spoil, ruin, sabotage, fumble, and bungle. Each of these words can be used in place of "bolloxes up" to describe a situation where something has not gone according to plan. Whether you're writing a report, chatting with friends, or simply trying to find new words to express yourself, these synonyms can help you communicate more effectively.