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Originally Posted by 4691mls
Though I suppose you could stretch the theory that the concept existed to slang also, so if a character says things like "cool" or "OMG" it represents an 1800s equivalent 
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Except those examples, esp. OMG, might be dated very quickly. Slang needs to be for a book set at a particular time. Modern slang would perhaps be OK for a book specifically set in 2018, but not for either one set in the 20th C or earlier, or even set today that isn't specifically referencing current culture. Though books referencing current culture can be more incomprehensible to a teenager in 10 years time than maybe The Famous Five, because it has almost no ephemeral cultural references, which mostly would have been cinema and radio stars. TV did exist but without much cultural impact till about 1955 in the UK, though probably 1950 in USA.