The phrase "bugger up" is often used to describe a situation when something has gone wrong or has been ruined. However, there are many synonyms for this phrase that can be used to express the same sentiment in a different way. For instance, you can use words like "mess up", "botch", "mangle", "ruin", "foul up", "screw up", "blow it", "flub", "fumble" or "bungle" to convey a similar idea. These words can be used interchangeably, depending on the context and the intended tone. For example, "I totally messed up that presentation" or "He bungled the interview". Whatever the occasion, there's always a suitable synonym that can be used to replace "bugger up".