Green’s Dictionary of Slang

duddy adj.

[dud adj. (2)]

(Aus.) useless, incompetent.

J. Barr in Sinclair Hist. of N.Z. (1959) 94: When to New Zealand first I came, / Poor and duddy, poor and duddy.
[Aus]D. Niland Shiralee 122: Can’t the duddy weather office give us a bit of a change?