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1. Eye-flirting with the driver of the car next to you at a red light, then never seeing the stranger again.

2. Similarly, a romance that lasts a short amount of time with few hard feelings when it ends abruptly.

3. One-night stand
Look, this guy next to you is trying to catch your eye. Give him his little red-light romance.

Brenda: Hey, where's your new beau?
Susan: New beau? Oh, Gods no. Just a little red-light romance.
by Kamrie June 15, 2009
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