The country that exists in the minds of twenty-something-year-old travellers throughout the entire world. It's citizens are identifiable by their dreadlocks, faux-tribal tattoos and strict, tiresome adherence to a Bob Marley tunes. They eat falafel and juggle fire torches. Their economy is based around mooching, and the sale of Tibetan prayer flags and Che Guevarra marijuana pipes. Backpackistanis are united by a common language: broken English.
Even though I spent a year travelling through Paris, Madrid, Morocco, Bangkok, Bali, Sidney, Sao Paulo, Machu Picchu, Guatemala, and Southern Utah, I feel like the only country I really visited was Backpackistan.
The Rule of Backtracking mainly applies to the game Dead Space, where the player does a lot of backtracking throughout the levels. Basically, if you leave an area where you've killed monsters and then come back, those monsters will have mysteriously respawned. It's handy for players to know, especially on Impossible Mode, that just because you have cleared out an area does not mean that it's totally safe for the rest of the game.
Pedro: What the heck is this crap? Man, I swore I cleaned out this area, and now there are more monsters! I don't have any med packs left!
Napoleon: Dude, the Rule of Backtracking, man.
*player is mauled to death by a Necromorph*
Napoleon: Told you.