Mareos literally means "dizziness". When you run around in circles, you might say afterwards: "tengo mareos" ("I feel dizzy"). But this word also has other interesting meanings. If someone's so drunk that they can't walk in a straight line, you could say: "es mareado" ("he's tipsy"). And here in the Andean highlands, mareos often has a special, specific meaning. It's very common for people to have altitude sickness in the mountains, and the common symptoms of dizziness and light-headedness are referred to as mareos.