Green’s Dictionary of Slang

ring-a-ding adj.

perfect, ideal.

1960		‘Lord Buckley’ Hiparama of the Classics 22: He’s havin’ a ball of all balls, happy as a ring a ding bird in a ding dong tree.
1962		Mad mag. Dec. 24: Frank Sinatra here, with a ring-a-ding home movie.
1995		A. Heckerling Clueless [film script] So you didn’t want to make a night of it with the ring-a-ding kid?
2021		J. Ellroy Widespread Panic 47: ’54 was a ring-a-ding year.