A unicorn at the state of being a baby, like a horse is called a pony. So a unicorn is called a "unipony".
Child: Mommy if a horsey is called a pony, then what is a unicorn called?

Mother: How the hell am i supposed to know?

R.A.U.P. salesman: Its called a Unipony son.

by Petek25 May 30, 2008
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A cross breed between a plane ol pony and the ol majestic unicorn.
Sally turned to Sam as she screamed, "Look at that unipony!" As they watched it fly above them.
by jojogel October 13, 2017
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