Fan behaviour is where someone is obsessed with someone else. They tend to be the topic of their conversation and they sometimes even take it to the extreme of STALKING them.
I'm the topic of your conversation, that's what I call fan behaviour.
by Djalaoq November 30, 2016
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Whenever someone constantly makes you the topic of their conversations and/or statements.
Girl: *continuously makes TikToks about ex best friend*
Ex best friend: Wow, what fan behaviour
by traipsedup3 May 12, 2021
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