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?"