Beer that can be found in a dumpster normally found by a beer distributor many times because the case is damaged.
Many times high school kids will root through these dumpsters to find themselves free beer that they have a slim chance being caught drinking.
Friend 1:WOW howd u get that beer your only 17?
Friend 2:well i went and got some dumpster beer
Wow how did you get all these beer if you have no money?
Its dumpster beer silly