Used as an ironic insult to mock the fact that they are retarded and cannot spell. If they don't understand that you made the mistake on purpose, then the insult is further confirmed.
Person 1: "Dude, are you a reatrd?"
Person 2: "No, you are, you can't even spell"
Person 1: "Ugh, whatever"
Person 2: "No, you are, you can't even spell"
Person 1: "Ugh, whatever"
by FrenFran March 5, 2019
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