McKayla Maroney Says Ass Video Wasn't Hacked, Enjoy It

McKayla Maroney says the racy video of her dancing around in some thong underwear was NOT hacked -- it was meant to be posted and she's damn proud of it.

The video first surfaced on her Instagram page on Saturday -- and people went crazy thinking the 21-year-old Olympic gymnast may have been hacked.

But Maroney -- an aspiring pop singer -- says she absolutely meant to post the footage ... saying, "I didn't get hacked. unfollow if u need to. all love."