Green’s Dictionary of Slang

reck n.

(N.Z.) something second-rate, useless.

[NZ]McGill Dict. of Kiwi Sl. 92/1: reck a bad thing; eg ‘That stuff you got off Sibby, I tried it, it’s reck, eh.’.
[NZ]McGill Reed Dict. of N.Z. Sl. [as cit. 1988].