Top Definition
The situation that occurs when a man's penile shaft appears ridiculously small when flacid, but grows to an abnormal, if not surprising size when erect.
Michael's penis was 2 inches long when he was at his grandma's house, but later as he watched gay porn, his penile shaft grew to an impressive 10 inches. Michael experienced the Accordian Effect.

#penis #boner #shaft #erection #sex
de Ellikay48 23 Septembrie 2007
5 Words related to The Accordian Effect
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