slough (plural sloughs) 1  The skin shed by a snake or other reptile. That is the slough of a rattler; we must be careful. 2  Dead skin on a sore or ulcer. This is the slough that came off of his skin after the burn.
The name Groupon is a combination of the words group and coupon, which references the company's viral marketing business model.
By October 2010 Groupon was available in 150 cities in North America and 100 cities in Europe, Asia and South America, and had 35 million registered users. By the end of March 2015, Groupon served more than 500 cities worldwide, nearly 48.1 million active customers and featured more than 425,000 active deals globally. The idea for Groupon was created by now-ousted CEO and Pittsburgh native Andrew Mason.