Top Definition
A term invented by Brown University students (though its usage has spread to most other colleges) refering to the penis of a man who remains perpetually unerect, even when being sexually stimulated by a woman. It is often the result of intense sexual inactivity over long periods of time. Often, men with duckles can be sexually excited by other men, and tend to become homosexuals later in life.
Linsay Lohan can't even get that guy's duckles erect......cuz he's mad gay.
by Jordan November 19, 2004
When you see his dick and can't help but chuckle.
Omg Penny, I totally duckled yesterday when I saw Eric's dick.
by Kyle DeLaWhore May 27, 2016
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