[sandworm101]

In my kneck of the woods we call that backfire. A misfire is when something goes wrong in the cylinder such as the spark failing. Misfire can cause backfire, but not all backfire is traced to misfire. A very rich mixture can backfire without misfire.

[Rumudiez]

A backfire is when the exhaust goes back out the air intake. An explosion in the exhaust system is called an afterfire, and is far more common. Most people just say backfire for both, unaware of the other term