Etymology of the word slang
In its earliest attested use (1756), the word slang referred to the vocabulary of "low" or "disreputable" people. By the early nineteenth century, it was no longer exclusively associated with disreputable people, but continued to be applied to usages below the level of standard educated speech. The origin of the word is uncertain, although it appears to be connected with thieves' cant. A Scandinavian origin has been proposed (compare, for example, Norwegian slengenavn, which means "nickname"), but based on "date and early associations" is discounted by the Oxford English Dictionary. Jonathan Green, however, agrees with the possibility of a Scandinavian origin, suggesting the same root as that of sling, which means "to throw", and noting that slang is thrown language – a quick, honest way to make your point.