Top Definition
Jistines
(noun) Jih-steens
   A disease in which a girl becomes hopelessly annoying and follows people she thinks are her friends around all the time. She is also prone to believing she is friends with people more popular than she is, which makes her annoyingly confident around them. 
Girl 1: OMG that girl is sooo annoying. 
Girl 2: Oh, that girl? Yeah I heard she's got the Jistines or something. 
by ishiptedsweeran June 06, 2013

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