A term used to describe the one or two days after one participates in a Duke of Edinburgh expedition. It is called so because this period will be spend mostly with long lies in bed and hours of watching TV due to the inability to walk because of sore feet and shoulders etc. One may also avoid any contact with the outdoors and eat loads of takeaways to make up for the crap food they had to eat up in the hills.
Person 1: Hey are you going into town tomorrow?
Person 2: Sorry I can't. I have a DofE hangover I look hideous and I can barely walk.
Person 1: Oh ok then, I'm so sorry for you. *silence*