Bollocksed up is a British slang that means to mess up or spoil something. There are several synonyms that can be used to replace this phrase such as: messed up, screwed up, botched, fouled up, ruined, bungled, failed, flubbed, wrecked, and corrupted. These words can be used interchangeably depending on the context of the sentence and the severity of the mistake. It is essential to have a range of synonyms to use in writing and speech to ensure that we are communicating our messages effectively while maintaining the appropriate tone. By using synonyms, we can prevent repetition and enhance the quality of our language.