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.
Groupon was launched in November 2008. It grew out of another initiative called The Point, a website launched in November 2007 that lets you start a campaign asking people to give money or do something as a group â but only once a tipping point of people agree to participate. See Groupon's about page for more details: http://www.groupon.com/about.