1.verbTo make (an alcoholic beverage, e.g. absinthe or ouzo) cloudy by mixing it with water, due to the presence of anethole. This is known as the ouzo effect.
"Certain anise-flavored drinks have developed a mystique based on the exotic appearance of louching."
2.adjectiveOf questionable taste or morality; decadent.
3.adjectiveNot reputable or decent.
4.adjectiveUnconventional and slightly disreputable in an attractive manner; raffish, rakish.