According to the SPD post, the authorities were dispatched to the restaurant after receiving a call about a fist fight. When they showed up, they discovered five guys -- three juveniles and two adults -- were involved in the kerfuffle and arrested them. They also had the forethought to document the fitting moment with a photo.
The cause of the fight is unknown at this point, but the five guys were all charged with "affray" (under Florida law, two or more people fighting in a public place) and processed at the local jail.
Thrillist by no means condones or encourages criminal acts of any kind, but if you're going to break the law as a group and earn a nickname, you could do a lot worse than the Five Guys Five.
h/t Orlando Sentinel