Noun: Coming from a city or place relatively close to sea level to one of a higher altitude, you:
1. Need to consume less alcohol to get drunk
2. Drink the same amount as "usual" and are HAMMERED
3. Drink on top of a mountain and get progressively drunker as you decend the mountain (particularly at a high rate of speed, such as on skis or a snowboard).
4. Drinking on the roof of a sky-scraper. Baller.