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Among the rarest of vaginal slang, the Arby's #3 is referring to a roast beef sandwich. Roast beef deli sandwiches are comprable, in extreme cases, to gross, worn vaginas.
Person 1: "So how'd last night go?"
Person 2: "Well, apart from having to eat that Arby's #3."
by OMalley__Cat July 08, 2018
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