I think a high fat diet would be anything from 55% fat and upwards.
You can only go really high fat (65% and up) if you're able to eat really low carb. I eat 80% fat on my super LC days, and about 70% on average.

The main idea of what I'm doing is that you don't overdo the protein - just enough to stave off hunger. And that in the overall percentages, fat comes out highest.

I use Fatsecret online to count my percentages, but I'm also used to it now.

Coconut oil
olive oil
butter
eggs (egg yolks alone even better)
mayonnaise
nuts
cream cheese (if it doesn't stall you)