Fuck Around and Find Out (FAFO)
"Fuck Around and Find Out," often abbreviated FAFO, is a slogan used by the Proud Boys to suggest they are always prepared for a fight, and if a person confronts or messes with them, that person will be sorry. This slogan is commonly seen on Proud Boys' clothing or is spray painted as a symbol of the group. This phrase may also be used to a lesser degree by others in a different context.