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1.
To preclude a person or organization from an opportunity (i.e. - an event, deal, or situation) with a negative context.

In other words, the first party screws the second party out of a particular opportunity.
Upon arriving late to a dinner event, when dinner has already taken place.: "Well, it looks like I got jimmydicked out of dinner."

In a business context: "Why is Steve jimmydicking us on this deal?"
by FrankZappaSA August 31, 2011