Used by pseudo-intellectuals at the end of arguments. Means "PWN3D N00B" but they pretend it doesn't because they're trying really hard to be intelligent.
Mr. C: 2+2=4
PI: You are wrong QED
Mr. C: Based on what
PI: You're dumb QED
Mr. C: What?
PI: Haha I won the argument QED
Mr. C: ???????
PI: QED
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