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1.
Usu. a term to describe when crucial elements of a movie are about to be revealed (i.e. the ending, character deaths, a twist, etc.)
**Spoiler Alert!**

The girl in million dollar baby dies.
by INDIExCORE October 28, 2005
 
2.
1. A spoiler alert is where someone gives away the main plot or turning point in a movie, book, show, etc.

2. Something that someone uses to really piss people off.
Spoiler alert! Snape kills Dumbledore!
by thatonechickyousawonetime April 08, 2011
 
3.
a phrase uttered by someone before they ruin a movie/book/video game and by extention the next 3 days for you
Neal:How was the movie?

Jose:Spoiler alert

Neal:HIT THE DECK!

Jose:The monster in super 8 is *censored*

Neal: Curse you
by Gentleneal June 11, 2011