greybeard
Herd Master
It's not just "fancy sandwich shops" that called them that. For many years, pork belly futures were a commodity and were traded on the Chicago Mercantile Exchange. You would likely see it every evening on the news after the exchange rang their closing bell ..usually at the end of the market report. Trading in PB stopped about 5 years ago tho.
http://www.nytimes.com/2011/07/31/us/31porkbelly.html
http://www.wikinvest.com/futures/Pork_Bellies_Futures
http://www.nytimes.com/2011/07/31/us/31porkbelly.html
http://www.wikinvest.com/futures/Pork_Bellies_Futures