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"Lost penis" is when you are caught humping a chick by a family member (usually a parent, in-laws or girlfriend and/or wife) resulting in an immediate boner killer and great shame.
Sally's mom and I where doing it in her basement when Sally caught us. Well I suffered with lost penis for about a week until Sally's twin sister started dating me.
by Defcon 4 and waiting June 02, 2010
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