Green’s Dictionary of Slang

(N.Z. drugs) marijuana.

1999		D. Looser ‘Boob Jargon’ in NZEJ 13 29: dak n. Marijuana.
2001		www.youthlaw.co.nz Sept. 🌐 Here are classifications for some of the drugs used in Aotearoa New Zealand [...] Class C: Cannabis (Dak, Marijuana, Dope – both seeds and leaf), Barbiturates.
2010		W. Ings ‘Trolling the Beat to Working the Soob’ in Int’l Jrnl Lexicog. 23:1 74: A stash may also include dak (marijuana) or other drugs.