Costermonger a secret language, a code which only other costermongers understood. In her book, "Shadows of the Workhouse", Jennifer Worth observed that "Costers... spoke to each other almost entirely in back slang; incomprensible to an outsider." Many costermongers also used "rhyming slang"; where any word can be substituted with another word that rhymes with it. Examples of rhyming slang include: "tin lids" or "dustpan lids" for "kids"; "jimmy grant" for "emigrant"; "apple and pears" for "stairs"; "rubbidy dub" for "pub" and "trouble and strife" for "wife". The selection of rhyming words often suggested a symbolic association. For example, a "sorrowful tale"
London slang Queen Mary, University of London concluded that Cockney rhyming slang was dying out because children in London are greatly exposed to words and phrases from outside cultures. Teenagers especially are incorporating into their vocabularies new words borrowed from outside the UK. This new slang is also influenced by new technologies, especially mobile phone SMS (short message service) or text messages. While "dat" and "dere" may be of Afro-Caribbean origin along with many other terms, their use in text messages as easier-to-key options to "that" and "there/their" cement them as slang in common usage. The large number of immigrant communities and