Mountain googles are a mountaineering's equivalent of beer googles: After spending considerable amount of time on an expedition with a predominantly male group of fellow mountaineers, one's standard on female beauty becomes lowered. Like beer googles, the decrease in standard is proportional to the days spent away from civilization.
After 2 weeks in Nepal, he hooked up with the first girl that smiled at him. She was toothless. He had a serious case of mountain googles.