(from "tomorrow" and "moron")
1) a task given to an employee by his/her superior by the end of the day (usually 5 minutes before the end of work) with a demand to get it done for the morning next day which makes the unlucky employee stay at work extra hours (rarely paid for) like a moron, because everyone else can go and enjoy the evening and he/she is the one caught to do the dirty work;
2) a person caught by his/her superior 5 minutes before the end of the day at work to do something very important for the next day morning so he/she needs to stay longer to complete the task;
1) I had to stay at work till 8pm to finish the tomoron my boss gave me. It was a report he needed for the board the next day morning.
2) I was about the leave the office when Mrs. Jenkins, my boss, caught me and asked me to do her a small favour. The favour was a report for the last 10 years. It was something she forgot to do and needed asap. I could not say no, of course, and had to sit there for 3 hours to finish it. I felt like a tomoron.