Slang of Buenos Aires, Montevideo and Rosario, which then spread to South America in the 19th century. It was originally a prison language, which made it difficult for officers to understand what they were saying the inmates, but soon became popular and today is used by all social and cultural classes. It comes from the word " lombardo " used as " thief " and is probably an early allusion to the Lombard mafia installed in the port, or a reference brought by the French who remembered the Italian bankers 40 scams; 41 Lombardy; they offered mortgage loans and stayed with many of their properties.
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