Green’s Dictionary of Slang

(US black) a form of greeting, favoured by supporters of Black Power.

1980		E. Folb Runnin’ Down Some Lines 110: Got on your dashiki, some beads — maybe some sandals. Walkin’ down d’ street. ‘Bhani ghani, brother — Wha’s happ’nin’?’ [...] Frontin’ wi’ d’ Afro look.
2002		John Burkardt ‘Itty Bitty: Nonsense Rhymes’ Wordplay 🌐 This is a list of phrases made of pairs of words that rhyme [...] bhani ghani (a greeting).