also: ねたつぶし
spoiling a creator's future ideas by publicly predicting them
Slang used in fan communities when someone guesses upcoming plot points or developments so accurately that the creator may feel forced to change them, effectively 'crushing' the story material (ネタ).
See also: ネタ
If you predict the plot developments too much on social media, it can end up spoiling the creator's ideas.
ファンの考察が鋭すぎて、ネタ潰しだと言われた。
The fan theories were so sharp that people said it was spoiling the creator's material.
Compound of ネタ (material, story idea) and 潰し (crushing, from 潰す). The term likely arose in online fan communities.