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1.
Relationship-Absence Syndrome (also known as RAS)

1. Instance in which everyone around you is in a relationship and you are single.

2. Instance in which you are in a relationship and everyone around you is single
Person A: "Dude, everyone else is going out on dates."

Person B: "It's relationship-absence syndrome, man. Get over it."

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Person A: "No one else wants to go on a date with me and my girl!"

Person B: "Everyone else is suffering from relationship-absence syndrome..."
by Olive Nick March 31, 2011