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Cite your source or get the fuck out. A definitive way to end an online argument by requiring the person asserting a fact to reply with a reputable source for their assertion or quit the argument. Often written in frustration after the repeated assertion of nonsense or unverifiable facts, assertions or arguments.
A: Horses can't run backwards!
B: CYSOGTFO
by DeliciousWolf June 18, 2015
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