Get/turn nasty Definition 1 of 3Pro Tip 1/3Sudden Change Used to describe a quick shift from calm to hostile situations. The game was fun until a foul caused things to turn nasty. Pro Tip 2/3Tangible Risk Implies a potential threat or real danger becoming apparent. The sky was clear, then the weather turned nasty and we rushed inside. Pro Tip 3/3Avoiding Conflict Used to emphasize the avoidance of situations that may become confrontational. When their conversation started turning nasty, I left the room.