slay a unicorn

verb- The act of someone hooking up with one of their dream girls.

Holy shit dude I just got to slay a unicorn, I'm just calling to tell someone so I know it really happened later!

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slay that unicorn

Overcoming an obstacle that has eluded for so long as to seem impossible.

In trick dog training, a Unicorn trick is the trick that has been so difficult to achieve that it seems like a mythical construct - an impossible dream. Thus, Slay that Unicorn is finally accomplishing the impossible!