Use 'thwack' to emphasize the force of the action and the sound it makes.

Action Impact

'Thwack' is often used to express a release of strong emotions like anger or excitement.

Emotional Release

'Thwack' is informal and more commonly used in casual or humorous speech and writing.

'Thwack' refers to a specific, sharp sound made by firm objects colliding.

The sound of a 'thwack' is typically loud and sudden, suggesting a forceful hit.

In storytelling, 'thwack' adds dramatic effect to an action's description.