If you have ever had a sense or experience of “something” deeper and more meaningful that lies beyond the everyday you, yet that is you in some way, you have had a taste of nonduality.
The taste of nonduality is the sense or experience of unity, peace, “something” vaster than the everyday you. The taste may be known through an experience in nature, from music or art, from being deeply involved in a hobby or work, from being in the “zone” during an athletic event, from sex, a walk in the park, dance, surfing, having a few beers, or other social interaction.
It may be known in meditation, Yoga, any other spiritual practice, a near death experience, while driving your car, or in the midst of any activity, or for no apparent reason at all.
If you have ever felt deeply dissatisfied, intensely unhappy, psychically imprisoned, it might be said that you can only feel this dissatisfaction because part of you knows there is a place of freedom. That freedom is the experience of nonduality. Your unhappiness may be viewed as the hunger for the taste of nonduality, nonseparateness.