The boing is a classic cartoon sound effect, long associated with springs, bouncing objects and slapstick animation, where a stretched spring snapping back creates its instantly recognisable wobble. On TikTok, short creators began pairing the double boing with jumps, falls, pranks and exaggerated reactions, turning a familiar comedy cue into a quick audio punchline for vertical video. Its popularity comes from that instant recognition: listeners know a joke is coming before the action finishes, which makes it easy to reuse across dances, skits, fails and reaction edits without losing its timing.