ridgy-didge
Concise Oxford English Dictionary © 2008 Oxford University Press:
ridgy-didge /ˈrɪdʒidɪdʒ/
▶adjective Austral. informal genuine, original, or good.
– origin 1950s: from ridge, an old slang term meaning ‘gold, gold coin’.
'ridgy-didge' also found in these Oxford entries:

