an abode that is made by usually intoxicated individuals in an effort to either get warm, or, just be ladzy. Usually made from pillows stolen from the owner of whoevers house your crashing.
Also a term used in conjuction with someone being a total champ, when using it in this context it is referred to as 'master of the den' or 'denmaster'
A fort made by a kid or a group of kids for them to hang out. A den is usually made out of large pieces of trash like old woodenplanks and a tilet... Ok maybe not the toilet but I have seen one den like that!