Of unclear origin, although many spurious theories exist. Possibly of Jamaican origin, as an extended form of boo-ya. Intended as a simulation of a gunshot and used in hip-hop, e.g. Keep Their Heads Ringin’ by Dr Dre (1995) and before that by Boo-Yaa T.R.I.B.E. in the late 1980s. Popularised by comedian Sacha Baron Cohen, whose character Ali G used it during the 1990s and early 2000s.
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