Top Definition
When a person in a group of friends starts to like someone, many other people in that group also begin to like that person.
I liked Haley first and then all you guys started liking her. You all just have Spontaneous Group Infatuation Syndrome. You dumb pricks.
by Sleet October 05, 2009

The Urban Dictionary Mug

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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The Urban Dictionary Mug

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