Language game
A language game (also called secret language or ludling or argot) is a system of manipulating spoken words to render them incomprehensible to the untrained ear. Language games are used primarily by groups attempting to conceal their conversations from others. Some common examples are Pig Latin; the Gibberish family, prevalent in the United States and Sweden; and Verlan, spoken in France.
A common difficulty with language games is that they are usually passed down orally.
While written translations can be made, they are often imperfect, and thus spelling can vary widely.
Some factions argue that words in these spoken tongues should simply be written the way they are pronounced, while others insist that the purity of language demands that the transformation remain visible when the words are imparted to paper.
Use
Language games are primarily used by children to disguise their speech from others, which in most cases are parental figures. Some language games such as Pig Latin are so widely known that privacy is virtually impossible, as most people have a passable understanding of how it works and the words can sound very similar to their English counterpart. Although language games are not usually used in everyday conversation, some words from language games have made their way into normal speech, such as ilchay in English (from Pig Latin), and loufoque in French (from Louchébem).