english Dumpsterdiving definition in Wikipedia

http://en.wikipedia.org/wiki/Dumpster_diving

Dumpster diving (known as skipping in the UK)^[1][2] is the practice of sifting through commercial or residential trash to find items that have been discarded by their owners, but which may be useful to the dumpster diver. The practice of Dumpster diving is also known variously as urban foraging, curb shopping, binning, bin diving (mostly British), alley surfing, aggressive recycling, curbing D-mart^[3], dumpstering, garbaging, garbage picking,garbage gleaning, dumpster-raiding, dump-weaseling, tatting, trash picking, treasure hunting, skally-wagging, or trashing.

The term originates from the best-known manufacturer of commercial trash bins, Dempsey, who use the trade name "Dumpster," for their bins, and the fanciful image of someone leaping head first into a dumpster as if it were a swimming pool. In practice, the size and design of most dumpsters makes it possible to retrieve many items from the outside of dumpsters without having to "dive" into them.

In rural areas and some ancient agricultural societies, a similar process was known as gleaning and some medieval houses had "poor boxes" where still edible food was placed for the poor to take.