[Last night Meredith mistook Derek's sister Nancy for his one-night stand]
Derek had a woman in his trailer last night. She was ugly. Very ugly. Except she was tall and beautiful and he was naked.
Oh. Uh, McDreamy was doing the McNasty with a McHottie? That McBastard.
[Later, Izzie and Meredith meet Nancy, who is visiting Seattle Grace.]
[to Meredith] McDreamy's sister is McBitchy.
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