Foul territory is a term used in baseball to describe the area outside of the playing field. It is also known as the 'outfield' or 'out of play'. The two crossword solutions, PIGPEN and STY, are both related to this term. PIGPEN is a slang term for a messy area, which is often associated with foul territory in baseball. A STY is a small enclosure, which is also often associated with foul territory in baseball.