Why: In the New Yorker story "Temporary" by Marisa Silver:
After a few months, the canvases disappeared, though it was unclear to Vivian whether someone had finally bought them or Shelly had just thrown them into the Dumpster behind the ribbon warehouse to be carted away along with the giant spools of badly dyed grosgrain.Answer: Omg yes! Who knew?
The word Dumpster came from the Dempster-Dumpster system of mechanically loading the contents of standardized containers onto garbage trucks, which was patented by Dempster Brothers in the 1930s. The containers were called Dumpsters, a portmanteau of the company's name with the word dump. However, it took the Dempster Dumpmaster, the first successful front-loading garbage truck (which used this system), to popularize the word.Source: Wikipedia
The More You Know: Dumpsters all smell like rotten pizza, and they all remind me of the blacktop outside my elementary school.