Green’s Dictionary of Slang

(S.Afr./N.Z. teen) excellent, first-rate.

1986		P. Slabolepszy ‘Boo to the Moon’ in Mooi Street (1994) 103: Shame, hey? Just think a’ that. No one’s gonna check you in that lekker Sue Ellen outfit again.
1996		CyberBraai Lex. at www.matriots.com 🌐 Shame: Like ‘No’, this word can mean the opposite of its meaning in other parts of the world. If someone shows you a baby, you can say: ‘Ag, shame.’ This does not mean the baby is ugly -- it means the baby is cute. If the baby is ugly, it is more accurate to say: ‘Shame, hey.’.
2003		McGill Reed Dict. of N.Z. Sl.
2010		Mail & Guardian (Johannesburg) 23 Mar. 🌐 You will also be required to say ‘ag, shame’ a lot. Ag shame can be used to express pleasure, gratitude, disappointment, pity and surprise.