I've heard two explanations for this.... 1) it is a mangling of the phrase "wee drop o' the creature" 2) it refers to "crater" --a cup/bowl/mazer/goblet/glass for holding beverage type thingie
1) it is a mangling of the phrase "wee drop o' the creature"
2) it refers to "crater" --a cup/bowl/mazer/goblet/glass for holding beverage type thingie