Blow off Definition 1 of 5Pro Tip 1/3Politeness Level Using 'blow off' in this context can sound rude or harsh — best for casual conversations. Is Jake mad I blew him off last night? Pro Tip 2/3Not Intentional Sometimes 'blow off' is used when missing an event unintentionally or forgetfully. I didn't mean to blow off your birthday party. Pro Tip 3/3Conflict Avoidance It may be used to avoid someone without direct confrontation. She blew off her ex at the party.