A manicorn that is still growing up, thus called a teenicorn. Prime examples of teenicorns are characters portrayed by Michael Cera. Other such examples are Keith (Eric Stoltz) from "Some Kind of Wonderful", Jake Ryan (Michael Schoeffling) from "Sixteen Candles", and Chris (River Phoenix) from "Stand By Me".
girl 1: Have you seen "Pretty in Pink?"
girl 2: Yes! Blaine is a total teenicorn!
by Vamptastic October 17, 2008
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