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A tool used by O-girls to spot other O-girls. Sometimes, an O-girl will wear something that isn't denim, and that's when the confused ones go, 'Wait, is that an O-girl or just a regular girl?'
'Is that an O-girl? She’s wearing a skirt that isn’t denim!'
'I thought she was an O-girl, but she’s wearing a pink skirt!'
'He can’t tell if she’s an O-girl or just a girl who likes pink.'