Green’s Dictionary of Slang

(N.Z.) methamphetamine.

2002		www.parliament.nz 1 July 🌐 The crystal form of the drug is often referred to as ‘Ice ’, ‘Pure’ (‘P’), ‘Crystal Meth’, ‘Glass’, or ‘Shabu’. ‘P’ is a crystalline powder form that is between 70 and 90 percent pure.
2008		http://www.stuff.co.nz 11 Apr. 🌐 The use of P, or methamphetamine, took off like a rocket in 2002.
2016		Guardian 21 Nov. 🌐 Officers discovered nearly 500kg of methamphetamine or ‘P’ as it is known in New Zealand.