It’s Zac Brown’s Tattoo!

Zac Brown has multiple tattoos, including similar works on each arm and at least one more that's barely peaking out from beneath the cuff of his short sleeve t-shirt in this photo. He may have others, but they are only for his wife Shelly to see. It's not clear why Brown is slow dancing eighth grade style with Taylor Swift here, however both country hitmakers seem to be enjoying themselves.