Sheng is primarily a Swahili and English-based cant, perhaps a mixed language or creole, originating among the urban youth of Nairobi, Kenya, and influenced by many of the languages spoken there. While primarily a language of urban youths, it has spread across social classes and geographically to neighbouring Tanzania and Uganda.

The word "Sheng" is coined from the two languages that it is mainly derived from: Swahili and English. The "h" was included from the middle of "Swahili" because "Seng" would have sounded unusual. The term is first recorded in 1965.^[3]

Originating in the early 1950s in the Eastlands area of Nairobi (variously described as a "slum", "ghetto" or "suburb"), Sheng is now heard among matatu drivers/touts across the region, and in the popular media. Most of the Sheng words are introduced in various communities and schools and given wide exposure by music artists who include them in their lyrics, hence the rapid growth. It can be assumed to be the first language of many Kenyans in urban areas.

Like all slang, Sheng is mainly used by the youth and is part of popular culture in Kenya. It also evolves rapidly, as words are moved into and out of slang use. It found broad usage among hip hop artists such as Kalamashaka and G.rongi in the African Great Lakes region in the '90s, both mainstream and "underground" (whose music helped spread the language and contribute to rapid changes or shifts in Sheng vocabulary), as well as among virtually all university and secondary-school students, the language was not always associated with people who cannot do much for the society until when the Kenya Broadcasting Corporation noted the rise in both class and diversity. Radio presenters John Karani, Jeff Mwangemi and Prince Otach, and many more, took it to the mainstream by presenting the first radio shows using Sheng phrases on the national broadcast. By 2010 almost every media show had some sort of sheng it.

Although the grammar, syntax, and much of the vocabulary are drawn from Swahili, Sheng borrows from the languages of some of the largest ethnic groups in Kenya, including Luhya, Gĩkũyũ, Luo and Kamba. Words are also borrowed from languages that are neither a local language nor English – such as the Sheng word morgen "morning" – a Sheng word used in some areas with a similar meaning in German.

Sheng vocabulary can vary significantly within Kenya's various subdivisions and the larger African Great Lakes region, and even between neighbourhoods in Nairobi. Many youth living in the capital often use the argot as their everyday mode of communication rather than Swahili or English.

Many Gen Z and Millennials easily adapt to other variants of Sheng like Shembeteng, Shengilo and Shengtezo.

The use of social media platforms like TikTok have contributed to the growth of Sheng.

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The written use of Sheng in literature is still a minor phenomenon. Some poems in the African literary magazine Kwani? have been published in Sheng, but the first and only book in this language is "Lafudhi hip hop poetry in Sheng" (2015), written by G rongi.

• Engsh
• Kenyan English