A term for someone that thinks they are unique and special, but really are not. It gained popularity after the movie "Fight Club" from the quote "You are not special. You're not a beautiful and unique snowflake. You're the same decaying organic matter as everything else."
Began being used extensively as a putdown for someone, usually on the political left, who is easily offended or felt they needed a "safe space" away from the harsh realities of the world, but now has morphed into a general putdown for anyone that complains about any subject.