oupa juice, n. — Green’s Dictionary of Slang

oupa juice n.

[Afk. oupa, an old Afrikaans man + juice n.¹ (3)]

(S.Afr.)

1. liquor.

1990

Sun. Star 11 Mar. (Mag. Sect.) 26: A row of low built in cupboards against a wall hides a TV set [...], three shelves of what Marais describes as his ‘Oupa juice’ and, finally, a built in fridge [DSAE].

2. opium.

2003

‘Worksheet 9: Self study of drug abuse’ St Alban’s College 🌐 Opiates e.g. opium (oupa, poppy).