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Verb. (1) to compel someone who is currently in a relationship to date you instead (2) to change your dating partner

Noun. (2) an external compulsion to switch one's current dating partner that may or may not be brought on by a shackwrecker. (3) the act itself

Other forms...shackswitching, shackswitched
Although Joanna was dating Craig at the time, Joseph convinced her to make a shackswitch.
by Ambina D'Bidanza April 19, 2011
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