Green’s Dictionary of Slang

shit-all n.

also shite-all
[var. on fuck all n. (1)]

nothing at all.

[US]G.V. Higgins Rat on Fire (1982) 90: Just a kid that didn’t know shit-all from what he was doing.
[UK]Guardian Weekend 1 July 20/3: The lads thought ‘we’ve got shite-all’.
[US](con. 1964–8) J. Ellroy Cold Six Thousand 174: The Sheriff’s man knew shit-all about it.
[US]I. Fitzgerald Dirtbag, Massachusetts 53: [W]e didn’t have shit-all else to do.