Top Definition
The act of overzealously agreeing to do things with friends and acquaintances during a party or other social gathering despite the fact that ordinarily you would have no interest in doing so. Often followed by flaking out and not following through with the plan.
Able agreed to go to the Museum of Modern Art with Betty and Charles, but he was really just partyjoining.
by DaulRichardson October 23, 2010

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