slang: A unknown fact within a series (generally of a future event) that ruins
and mystery for newer fans.
What constitutes a spoiler is often debatable but a good rule
for determining one is the "3 of 6 rule
". The "six" are Who, What, Where, When, Why, and How. If a comment has atleast three of these six then it can generally be called a spoiler.
One of the only exceptions to the "3 of 6 rule
" is "X dies" or "X is dead" as this is still considered
a spoiler because the When or How is generally considered irrelevent
when it comes to deaths.