A desolate, usually rural area out in the middle of nowhere that looks similar to the typical settings used in slasher horror films such as Texas Chainsaw Massacre.
Hey man, fill up at this next gas station, I'm not trying to get stranded out in the middle of slasher territory.
Becky: It's midnight and this is the last motel for 50 miles, lets stop and rest.
Sara: Fuck that, i'll die falling asleep at the wheel before being knocked off by some psycho out here in slasher territory.