Green’s Dictionary of Slang

(Irish) nothing at all; a euph. for fuck all n.

1976		H. Leonard Time Was (1981) Act II: It has feck-all to do with me.
1986		(con. 1930s) P. O’Farrell Tell me, Sean O’Farrell 59: He roared ‘Since you became a civil servant you do feck-all only sit on your arse like the rest of them.’.
1999		D. Healy Sudden Times 35: And what use is the TV? Feck all.