Tick off Definition 1 of 3Pro Tip 1/3Colloquial Expression Used informally, often among friends or in casual conversations. When the server ignored us, it really ticked me off. Pro Tip 2/3Show Emotion Expresses feelings of annoyance or frustration, not strong anger. His constant humming during the movie ticked me off. Pro Tip 3/3Can Escalate Repeated actions might tick someone off more each time. She ticks me off more every day with her lateness.