In interactions with their peers, South African male youths use a way of talking that is different from the local varieties spoken in their communities. Labelled tsotsitaals, this practice involves inserting a slang lexicon into the syntactic base of a local language combined with other paralinguistic features. Most studies of this phenomenon have looked at Afrikaans and Bantu language-based tsotsitaals but there are also several instances of English-based tsotsitaals among male youths in English-speaking communities. Across all tsotsitaals, English-derived words make up a substantial part of the slang lexicon. Ethnographic studies among young men who use Bantu-based tsotsitaals show that English plays a key role in indexing different identities. Based on the social meanings they attribute to English use, they incorporate English in a variety of ways making up different styles of tsotsitaal. These styles reflect different social levels, identities, attitudes and aspirations. The way English is incorporated into tsotsitaals challenges common approaches that treat this performance register as an autonomous referential system.