One who is a "party pooper." Usually makes a great day worse and gloomy. You don't want to be a sore or be friends with a sore.
Short for "sore loser" just sounds cooler.
Kid 1: Man, today is such a good day!
Kid 2: Think about all the people in the world dying right now... is it still good?
Kid 1: You're such a sore!
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