When one has to make something up, or when one has made something look like a greater amount of effort and work has gone into the production of it. Often, but not always, involving the duplication of others work or terminology in order to produce something that looks like ones own.
A term synonymous with bullshitting, blagging, making up or too 'wing it', though more often used within the architectural profession.
"That Nathaniel sure was laying on the swift real heavy"
"I sure had to write a loft of swift to get those plans through building control"