mongo n. material or goods salvaged from items intended for disposal. Also as verb. Editorial Note: New evidence from the unpublished Lexicon of Trade Jargon, compiled by the Works Progress Administration, has a form of this word from before 1938: mungo, referring to the person who salvages discarded items, rather than the things being salvaged. This term appears to be specific to New York City. (source: Double-Tongued Dictionary)
Further reading
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The slang phrase someone ate and left no crumbs means the person did something really well. In a previous call, a listener who works in theater noted the use of ate to mean “did something well,” as in they really ate that haircut! This...