The term "shack job" refers to a poorly constructed or unprofessional construction project or renovation. Some synonyms for this phrase might include terms like shoddy work, cheap construction, inferior craftsmanship, or careless repairs. Other similar expressions may include vernacular terms like half-assed job, slapdash work, or botched construction. Regardless of the specific phrasing, all of these descriptors highlight the low-quality nature of the work in question. They suggest that the builder or contractor did not invest the time, effort, or expertise to perform a thorough and competent job, resulting in subpar workmanship that looks unsightly and is often unsafe for use.