Acronym for "Owning the Moment," a phrase inspired by the Fast Six single 'We Own It' by 2 Chainz and Wiz Khalifa. To own a moment means to do something so spectacular and positive that you should be acknowledged for it and celebrate how awesome you are. You're meeting your goals and beating your deadlines, making drastic changes in your life as well as others lives. These are permanently owned moments that belong to you and cannot be taken away from you by trolls, sore sports, and haters.
(Fast Six characters text messaging scenario)
Dominic: U really OTM'd back there. Thx for having my back.
Hobbs: This doesn't mean you're off the hook just yet, Toretto.
(Twitter scenario paraphrased via Rap Genius)
@WizKhalifa: No one can say that we don't deserve this moment. We worked hard to reach the success, and got it, and nobody gon' take our place.
@2chainz: Yup. #OTM
Boy: I finally got that promotion at work!
Girl: Wow, you're really owning the moment! Nobody can take this moment away from you because it is yours to keep.