Place it right after the confusing line in your edit, then follow it with a dun dun dun reveal for the bigger reaction beat, or switch straight to the vine boom sound for a second hit instead.
About this sound
TeenFSFS is a seven second sound effect clip with no clear voice or musical hook described in its details. It gives a listener a brief, puzzling jolt, the kind of odd, out of context energy that makes a short clip stick in a group chat after one press.