Blow a fuse Definition 1 of 2Pro Tip 1/3Emotional Intensity Indicates extreme anger, often used for sudden outbursts, not mild irritation. He'll blow a fuse if you scratch his car. Pro Tip 2/3Informal Context Used mostly in casual speech and informal writing, not in formal documents. My coach blew a fuse when we lost the game. Pro Tip 3/3Not Literal Understand it's a metaphor for anger, not someone actually damaging electrical equipment. Mom blew a fuse when I failed my math test.