(n) a subtle pleasure expressed when the brain is exposed to stimulating discussions. Such non-sexual pleasure, bonds the people taking part in it. This activity often occurs between Bibi and Chouchou.

A sudden rush of short-lived intellect, intelligence, or insight on a matter or idea.

When your brain finally figures out something that was on the tip of your tongue (i.e. an eighties song or the name of a movie, etc.) and you end up yelling it at a random moment after the fact that is at a point of time that has nothing to do with the thing that you remembered !!

A pleasurable tingle one experiences on the scalp. Has other meanings

It is a type of orgasm acheived from mind. Sexual arousal is physical and mental—but if one tries hard enough, our thoughts really are all we need to get off.
Some people can actually ‘think’ themselves off through fantasy and breath work.
These are sometimes called “energy orgasms,” because the method requires developed brains. Orgasms from “thinking off” show up in the same spot of the brain as orgasms from genital contact.

An unintentional orgasm without any real stimulation so it's all in your mind.

Brain fantasies