The term 'goldbrick' is still in use. Usage goes back about 150 years, primarily in the U.S. Originally it referred to an actual 'brick', made to appear precious, but mostly useless.
It can be used as a noun, verb, adjective.
Over the years, the meaning has expanded.
In regards to a person, it refers to a worker who makes the appearance of being useful, valuable, but mostly is not productive, and much less valuable than appearances.
They are lazy, malingerers, skackers, loafers, and have the appearances of what they are. Rather useless.
Goldbricks are these things, but they have camouflaged their true nature. They are not obviously slackers and time wasters.
Instead of one trip for three items, they will make three trips for one item.
What can be done in ten minutes, will take an hour.
When in sight of other workers, they will always be on the move. Briskly walking here and there, they often have something in their hand, any piece of paper will do. They appear to be a person with a mission. Their mission is to burn up time.
Busy doing anything - except the assigned duties.
Like most slang words, there is no precise meaning.
No one likes a goldbrick. They are generally more congenial and sociable than the typical loafers, but they never fail to avoid their responsibilities, putting the work off onto others.