A state or feeling of extreme serenity and peace within your current state of being. To be one with yourself and existence. It is the way you feel when you have no worries whatsoever, all of life is good and you just want to chill. It is that high on life that is achieved when hanging out with friends and loved ones. Usually achieved through controlled substances.
Hey dude check out that dude, he's so fa'irie right now, hes totally one with himself looking all smooth and chillled out!