When one is contacted via telephone and asked to "pop round to the office". When one does so, the conversation promptly goes off topic and results in an extended stay in the "office" reducing work productivity by at least 90%
Colleague 1: "Did you get lost?"
Colleague 2: "No... Worse... I Got Marked"
Colleague 1: "Oh no... What now?"
A person who is "marked" has enemies after them. In older English, we would say they are a "wanted man" or "being hunted", meaning that there is a person or group of people actively seeking out that person, with a desire to ruin their life or injure them. More commonly however, it is used ironically to describe a situation when something bad happens to someone, such as losing something or failing at a simple task.
Marked bill. Marking bills are a technique used by police to trace and identify money used in illegal activities. The serial numbers of the bills are recorded, and sometimes markings are made on the bank notes themselves (such as with a highlighter or other writing ).
In movies (at least) you hear bank robbers demand unmarked bills. They want the money to not be tracable. They would look over the money that was handed to them, to make sure that the serial numbers are not sequential. Unmarked bills are bills that do not fit the definition of marked bills