Top definition
When two people are dating only because -
- Their friends hooked them up
- One, or both, owes it to the other
- Are fuck buddies that don't want to be labeled such
- One, or both, is using it as an excuse to not be single
- The two actually deserves one another

Even though the causes for a Fallacy Relationship vary, it can always be characterized by one, or both, of its members heavily neglecting the relationship till need arises.
-"Why didn't your girlfriend to come?"
+"Sorry, I forgot to invite her."
-"I thought you two were attached at the hip?"
+"Oh no, we're just a fallacy relationship."
by Mrjohndoe October 26, 2014
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