Green’s Dictionary of Slang

(S.Afr. township) to drink.

1974		Randlords and Rotgut in Gray Theatre Two (1981) 92: Don’t be a loser, come and phuza!
1977		P.C. Venter Soweto 124 : Say, ‘Auntie, what about a popla?’ That means you would like a beer. Or, ‘A dop of moonshine, sister!’ [...] Or even, ‘I just want to pusa’. Meaning you want to fly high on something and you are not particular.
1982		Voice (Johannesburg) 4 May 23: Neither am I an extremist as to suggest that we don’t phuza at all — ach that would be the day ... We go about boozing ‘to hell and gone’ [DSAE].