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The aim of this paper is to offer a sketch of the different problems that faces the etymological search in a sociolect as the slang or thieves' cant, characterized by the lack of data, texts and documents, its orality, the rapid evolution -besides the tendency to archaism- and the great diversity of variants of a word. In order to do that, we analyse five terms (jicho, boqueras, tralla, butrón and bujarrón), that correspond to the multifunctional nature of this slang and his three forms of lexical creation: semantic and formal transformation and borrowings from other languages or slangs.
