boing
interj. countable C2 Proficiency bo·ing
interj. the sound of something bouncy or springy hitting a surface. You use this word to imitate the noise of a spring jumping up.
interj. an onomatopoeic representation of the sound made by a compressed spring or a resilient object rebounding from a surface.
The ball hit the floor with a loud boing.
Every time the cartoon character jumps on the trampoline, the speakers emit a comical boing sound effect.
The sound designer layered a metallic boing over the animation to emphasize the exaggerated elasticity of the protagonist's mechanical legs.
Usage
Often used as an exclamation or a sound effect in informal writing and comics.