Legally getting married typically only applies to same sex couples. However also adopted by those who support same sex marriage. It is also used for couples who are now having a legal ceremony, whereas prior only had a nonlegal ceremony.
After unit section 3 of The Defense of Marriage Act (DOMA) was ruled unconstitutional in 2013, this type of ceremony has become increasingly popular.
We are Getting Legalled. You are invited to attend the ceremony at x place at x time. Please RSVP by x date.
Improving yourself in someway. To strive to become the unicorn you've always wanted to be. Setting your goals high and doing whatever it takes to reach them.
Friend1: "Man, Sally has really been working out lately and even ran a marathon the other weekend."
Friend2: "Yeah, she's really getting her unicorn on."
Girl1: "I wanted to sell 100 boxes of cookies this year but I only sold 25."
Girl2: "Sounds like you weren't getting your unicorn on, huh?"
Guy1: "I'm going to have sex with every girl in this club tonight. I'm getting my unicorn on!"
Guy2: "Yeah! Let's do it!"
Lady1: "You're using that phrase wrong!"