Probably a typical ecstatic experience much like Speaking in Tongues in charismatic Christianity. All religions have some sort of ecstatic experience where the person seems to lose contact with the real world andsurrender to a higher power or higher wisdom.
Kundalini involves some sort of serpent, so Christians will tell you it is of the devil.
From what I read of it, it sounds like an orgasm to me.
It’s like a kegel exercise is it not?