Fay Kee Bolee is a language game used by Urdu-speaking people in Pakistan

Pakistan

Pakistan , officially the Islamic Republic of Pakistan is a sovereign state in South Asia. It has a coastline along the Arabian Sea and the Gulf of Oman in the south and is bordered by Afghanistan and Iran in the west, India in the east and China in the far northeast. In the north, Tajikistan...

. It can be regarded as a trivial substitution cipher

Substitution cipher

In cryptography, a substitution cipher is a method of encryption by which units of plaintext are replaced with ciphertext according to a regular system; the "units" may be single letters , pairs of letters, triplets of letters, mixtures of the above, and so forth...

 and it is somethings used by adults to converse in (perceived) privacy in the presence of children. It is close to games found in other languages such as farfallino alphabet

Farfallino Alphabet

The farfallino alphabet is a language game used primarily in Italy, which can be regarded as an elementary form of substitution cipher. It is usually used by children for amusement or to converse in privacy from adults...

 (Italian

Italian language

Italian is a Romance language spoken mainly in Europe: Italy, Switzerland, San Marino, Vatican City, by minorities in Malta, Monaco, Croatia, Slovenia, France, Libya, Eritrea, and Somalia, and by immigrant communities in the Americas and Australia...

), jeringonza

Jeringonza

Jeringonza is a Spanish language game played by children in Spain and all over Latin America. It consists of adding the letter p after each vowel of a word, and repeating the vowel. For example, Carlos turns into Cápar-lopos....

 (Spanish

Spanish language

Spanish , also known as Castilian , is a Romance language in the Ibero-Romance group that evolved from several languages and dialects in central-northern Iberia around the 9th century and gradually spread with the expansion of the Kingdom of Castile into central and southern Iberia during the...

/Portuguese

Portuguese language

Portuguese is a Romance language that arose in the medieval Kingdom of Galicia, nowadays Galicia and Northern Portugal. The southern part of the Kingdom of Galicia became independent as the County of Portugal in 1095...

), and pig Latin

Pig Latin

Pig Latin is a language game of alterations played in English. To form the Pig Latin form of an English word the first consonant is moved to the end of the word and an ay is affixed . The object is to conceal the meaning of the words from others not familiar with the rules...

 (English

English language

English is a West Germanic language that arose in the Anglo-Saxon kingdoms of England and spread into what was to become south-east Scotland under the influence of the Anglian medieval kingdom of Northumbria...

). The game is based on a simple substitution: adding an extra f before each vowel of a word:

• tum (you) = tfum
• kya (what) = kyfa
• kis (which) = kfis