The definition of feeling so happy that you want to run around and fly in the sky like a unicorn(depends on which version of unicorn, that is your choice to make).
A mix of the word Unicorn and terrific. It describes your feeling of being amazing or describing how amazing someone/something is. This means that you are a rare and very special. So since a Unicorn is so rare you must be one in a million. You should be honored to be called Unicornific!
person 1 Dude im so fucking high. Holy shit im a unicorn now
person 2 nahh dude you're trippin.... holy shit you are one
person 1 I told you that unicornification is real!!