Etymology

sir, this is an Arby's

Today it means: Used to indicate that one finds a statement to be bizarre, tangential, or inappropriate for the context in which it is made. Basically it is asking "What is this person even talking about?" Full definition →

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The story

From a humorous Internet meme that envisions a character giving a strange, rambling monologue, with the punchline being a fast-food employee reminding them that they are in a restaurant and are expected to simply order; Arby's is an American fast-food chain. This format of joke is first attested in a November 2011 tweet by American screenwriter Ethan Hunter (@ethanhunter).

Etymology from Wiktionary, CC BY-SA 4.0.