A Mexican liquor that is close cousin to the more famous Tequila. Mezcal is usually stronger, and is known for it's trademark worm which is placed in the bottle. The worm's preservation in the bottle is, according to legend, a sign of high proof in the liquor. Many fraternities believe that eating the worm (which, unlike the liquid it's found in, is relatively harmless) is a right of passage. High quality brands of Mezcal rarely carry the worm.
You aren't a true binge drinker until you've drank the Mezcal and eaten the worm.