Top Definition
To spoil the outcome of something (accidentally or on purpose)in a conversation; verbal or electronic, with another person. ie give away a movie ending, tv show, book etc

Often used with Spoilerer (someone who spoilered said movie/tv show for you)
"dude you totally spoilered that movie for me, you're such a spoilerer"
by monkeebot June 24, 2012

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