Nice one! Definition 1 of 2Pro Tip 1/3Positive Reinforcement Used to express encouragement and approval when someone has done something well. You just scored a goal? Nice one! Pro Tip 2/3Informal Cheers Primarily used in casual settings among friends or peers to show camaraderie. You brought snacks for the movie? Nice one, mate! Pro Tip 3/3Immediate Praise Often used right after the action or achievement it's acknowledging has happened. You aced the test? Nice one!