What is the meaning of Fireball?

A ball of fire, especially one associated with an explosion.

A meteor bright enough to cast shadows.

A feisty, strong-willed person.

A class of sailing dinghy with a single trapeze and a symmetrical spinnaker, sailed by a crew of two.

A charge made of a disc-shaped bomb shell, with four sets of flames, at the top, bottom and on either side.

A ball filled with combustibles to be thrown among enemies.

To explode in a ball of flame.

To pitch the ball very fast.

To attack with balls of fire.

Excellent; terrific.

Source: wiktionary.org