>>63600
'cunny' is a real word but it's very vulgar and isn't used much at all.

I'm a native English speaker and I've never once heard someone refer to the VAGINA as 'cunny' outside of the internet in obvious reference to the meme.
I only use the term myself to refer to European rabbits and that's the only use I've heard bar the usage of it as a term for a woman in the same you'd call a woman a bunny that I read in an old book once.

I'd consider it rule 8 because it's a 99.9% chance the person using it is using it because of those memes rather than it actually being something they'd say normally.