Popular use of this term began with it's association with the effects of the recreational substance known as Ecstasy (methylenedioxymethylamphetamine), however, this has now branched out to encompass a wider, deeper lifestyle and thinking process. One which can extend to manifest in the everyday life of those with a greater awareness of themselves and those around them.
(paraphrased from both text contained in "the book of E" by Push & Mirielle Silcott. OMNIBUS PRESS, 2000; and personal experience/journey)
"in the years before they were married, tim and sally shared their lives with each other to such a degree that an incredible empathogenesis formed between them"