dabba market
n.— «While the Sensex and the Nifty were making new records, the unofficial stock market or what is more commonly known as “dabba market” appears to have taken a beating.…Dabba trading is a parallel stock market where punters take positions with the prices in the regular market as references. The contracts, sealed orally in the kapli system (merely writing the amounts on a scrap of paper which serve as contract notes), are accepted for a day or a week.» —“Rising market knocks out dabba trading” by Dinesh Narayanan Mumbai Mirror (India) Nov. 29, 2005. (source: Double-Tongued Dictionary)