Tummo

And talking of Dzogchen, if you do it for long enough, this should happen.

The Tibetan means fierce female fire. 

It comes and goes but a while back it happened for two years solid. That was awesome because (1) it shows you are doing meditation right and (2) it is freaking beautiful and strange. Like having an alien inside you who teaches you stuff while healing everything.

It can occur without that. People often think they are going crazy when it happens without doing anything like meditation at all. Which is why Stanislav Grof wrote this.

There are two ways for it to happen: manual and automatic.

Manual can be a bit dangerous. Automatic is spontaneous and you are not in charge of it, so you don't tweak out demonically.

It's like your subtle body says “He's gone! Let's disco!”

Here is something like an unintentional hymn to it. Courtesy of my mom in law. I freaked out when I heard this first.