Top Definition
Rooted in the expression: "Hung like a horse", a Unicorn Dick or UD, refers to a exceptionally large penis with the magical powers of a Unicorn. These powers include: making women sneak out of bed with men they are dating in order to pursue the UD, making women jump from man to man looking to fill a void that only a UD can fill, and making women lie straight faced to a man they allegedly care about when confronted about sneaking out to pursue the UD.
I don't understand why she is with him, he has no job, he treats her like shit, and he spends all her money.

He must have a Unicorn Dick.

Whatever dude, Unicorns aren't even real.
af autobrick 25. december 2009

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