It means throwing or spreading substances under pressure or forcefully. It may refer to the defecate action. It can also be the action of a volcano to throw lava and rocks. The same is the spread of solids (rocks and trunks especially) after an avalanche (injection cone, alluvial fan). It is also possible to contemplate the action of ejecting a pilot from the cockpit of an aircraft that is going to crash, although in this case more eject is used.
