Top definition
A Barbie-like doll whose father was king of the unicorn and whose mother was queen of the princesses. She has a wand and an awkward-looking unicorn horn in the middle of her forehead. When she was young, she was doused in radiation but instead of dying she obtained magical powers.

From the show The Office.
Princess Unicorn says, "My Horn can Pierce the SKYYYYY!"
by rena gantley March 15, 2009
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