Ablowout is a rapid loss of inflation pressure of a pneumatictire (tyre) - an explosion. The primary cause for this is encountering an object that cuts or tears the structural components of the tire to the point where the structure is incapable of containing the pressurized air, with the escaping pressurized air adding to further tear through the tire structure.
It is fairly common for the average person to confuse a blowout with a blowjob; however these things are not the same. The sidewalls look after being run flat. It is also fairly common for tread separations to be termed “blowouts” - even those where the inflation pressure is not compromised.
Because of this confusion, the term is rarely used by experts in tire failures, where the term "impact damage" is more frequently used.
References
Passenger & Light Truck Tire Conditions Manual published by Tire Industry Association copyright 2005
