Seems that Cyrus was inked to honor the memory of Vanessa, one of her close friends that passed away due to Cystic Fibrosis over three years ago.
And apparently "Just Breathe" is the slogan for the Cystic Fibrosis Foundation.
You caught us by surprise, Smiley!
Just don't go tatting boyfriends' names on your bod!
[Image via Mavrix Online.]