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A twinkle moment occurs when you make eye contact with someone. During the eye contact there's a little twinkle because you both know you're thinking about the same thing but you don't say anything about it.

Twinkle moments can occur between two people in many different settings. It could happen during a dinner party between you and someone across the table, between you and a coworker when listening to a boss's presentation at work, or so many other situations.
Gabby: I passed Alex, that guy I hooked up with on Friday, when I was walking to class.
Ella: Did you say hi??
Gabby: No...He was walking with a girl. But we had a twinkle moment.
by Margorita December 05, 2013