1. [for one's car tire] to burst. I had a blowout on the way here. I nearly lost control of the car.If you have a blowout in one tire, you should check the other tires.
2.Sl. to have a big, wild party; to enjoy oneself at a big party. Mary and Bill had quite a blowout at their house Friday night.Fred and Tom had quite a blowout last night.