A secret language, or language game, 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: for example children wanting to keep secrets from adults or from other children. Some 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 have argued 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 committed to paper.

Aigy Paigy (or Haigy Paigy) is one such language, used by children. It works by inserting "aig"before the rime of each syllable. For, example the English "hello, how are you?" becomes, in Aigy Paigy, "haigellaigo, haigow aigare yaigou?"

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