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.
Fred: Man, I think Stacey is going to brake up with me.
Jo: What!?! Why?!yy
Fred: Well... I was having sex with her for the first time and... I... Have a big... Cock and I went unicorn deep. She still can't walk dude.
Dust you scrape off unicorns with a blade hand crafted by the jawas from Star Wars. This dust is very valuable and is worth around 23 Kraken teeth per Gram! You can snort it to become a unicorn for about 12 hours, or use it to teleport anywhere between 12 and 144 miles depending on the quality.