The word "pigpen" refers to a small and dirty area where pigs are kept. It can also be used to describe messy or untidy handwriting or a person who is not very clean. Full definition
The problem is not too little liquidity, but too many negative pigs growing too fast relative to the limited number of positive pigs whose growth is constrained by their digestive tracts, their gestation period, and places to put pigpens. (dotearth.blogs.nytimes.com)
Unfortunately these two methods overlap, as pigpens are frequently located near to fish ponds and goose ponds. (treehugger.com)
The «art» above the mantel is actually a gate from an old pigpen. (countryliving.com)