A warning given when someone is acting foolishly and about to face consequences, commonly used in the setting of a bar or street fight.
Ex. 1: When a person is provoked they might respond to the aggressor with "Fuck Around and Find Out."
Ex. 2: "Kind of a bummer to have been born at the very end of the Fuck Around century just to live the rest of my life in the Find Out century." - Twitter User @Merman_Melville
1. To fuck with someone that you know shouldn't be fucked with, then find out why they shouldn't be fucked with in the most painful and humiliating way possible.
2. Getting that stick up your ass pulled out sideways.
"You want mess with the wild Levi? You want to fuck around and find out?"
*Levi turns into Hulk, yeets a toolbox across the pressroom, and knocks someone's teeth out.