Green’s Dictionary of Slang

nephew n.

[generic use of SE nephew as a euph. for nigga n.]

1. (US Und.) a young homosexual boy (cf. auntie n.2 (1)).

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[US]Goldin et al. DAUL 144/2: Nephew. A youth who is maintained by male oral sodomists and active pederasts.

2. (US teen) a friend, thus as a term of affectionate address.

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[US]Teen Lingo: The Source for Youth Ministry 🌐 nephew n. A friend or acquaintance. A revised version of ni**a, as per Snoop Dogg. Replaces earlier terms such as homie, etc. ‘What’s up my nephew?’ or... ‘Have you seen that nephew?’.