DE Day

Today my teammate asked me "Are you going to be here tomorrow?". When one of us asks if the other is going to be there on a certain day, that normally means we want the day off. Sure enough, after I answered in the affirmative she said she was taking off. She then said she was taking a "DE Day". I'm sure I looked somewhat confused, so she said "I'm not telling you what it means". Of course, she later did. She said it stands for "disgruntled employee". There have been some recent situations that have pushed her to the limit, and she said she needs to take a day off before she kills someone. I loved this phrase. I think we all can use a DE day or two from time to time.