When two or more people are mentally connected and are capable to undesranding what the other is thinking.
When me and Nikki both said the same thing at the same time, we were connected by the purple line.
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Occurs when one is using the Maps app on an iPhone. Instead of actually reading the directions, the person simply makes sure that their blue location dot remains along the path of the purple directions line.
"Bro, what exit are you supposed to get off at?"
"No idea, man. I'm straight purple-lining right now."