Green’s Dictionary of Slang

a euph. for fuck all n. (1)

1992		Newcastle Eve. Chron. 3 Apr. 34/4: You can't sue the thieves because [...] officially they've got nowt and, because you're a decent hard working member of society you're rich. So you get naff all.
1998		Guardian Sport 2 Oct. 16: £17,000 a week for doing naff all.
2017		J. Phillips in Guardian 11 Feb. 🌐 Brexit was a sign of revolution for the people who voted leave. Definitely. It was naff all to do with Europe.