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When a girl is playing coy about her effect on everyone else in the room.

In The Sandlot, when Wendy Peffercorn is applying sun tan lotion to herself, the boys say, "she doesn't know what she's doing."

One replies, "Yeah yeah she does, she knows EXACTLY what she's doing..."
That girl that just walked in is so Wendy Peffercorning, just watch her.
by Airic Howse December 11, 2010