1 definition by BILLYFish, the second

A member of the Self Identifying Morons Association of New Zealand. Someone who posts a stupid comment like "covid is a scam" or "it's just a cold" then calls you a sheeple and tells you to do your own research when you present facts that counter thier 'reckons'. When they ask what a SIMANZ is you just tell them to "do you own research"