Historically, the term "bollocks" refers to testicles, which contributes to its status as a slang or "offensive" phrase in some dictionaries.
To (or "bollocks something up") is to completely ruin, mess up, or bungle a task through mistakes or incompetence.
It is primarily used in British, Irish, and Australian English and is considered vulgar or rude in most formal settings. 🏗️ Origins & Usage