Gravy
WordNet
noun
(1) A sudden happening that brings good fortune (as a sudden opportunity to make money)
"The demand for testing has created a boom for those unregulated laboratories where boxes of specimen jars are processed like an assembly line"
(2) Basically the juices that drip from cooking meats
WiktionaryText
Etymology
From ; probably from , , the sediment of melted tallow < . See .