- a sudden puncturing of a pneumatic tyre / tire
- a sudden release of oil and gas from a well
- a social function, especially one with large quantities of food
- (sports slang) A sporting contest that is decidedly one-sided and whose outcome is no longer in doubt. Often occurs when one team is superior to the other.
#: The game between the two teams was nothing but a blowout.
- (Australia) an extreme and unexpected increase in costs, such as in government estimates for a project.