The guys of Florida Georgia Line have admitted to having a huge addiction...  
To tattoos.
Tyler refers to it as getting the "itch" every month or so. His newest tattoo is a pic of his father on his forearm. (awww)
The guys like to get new tats anytime the mood strikes, whether it's a special occasion or not. Brian Kelly says it's a form of expression and a creative outlet. 
Also, it's a much safer addiction than some others. :)