I've never heard that term.

For some reason, there are laws about restaurants having to throw out certain food items - whethere cooked, left-over, returned by the customer, etc...

Kind of funny, but a town I lived in back in Missouri had an annual "dumpster diving" day, when folks would take their unwanted stuff to the street side, and anyone that wanted it could take it. Usually didn't just last a day, but everyone turned a blind eye to the several-day "city wide yard sale."