The act of hooking up and or going out with somebody in order to change someones views, opinions or actions of something. i. e. preventing a fight or something of that magnitude.
Alex: Hey weren't Tim and Harley supposed to fight because he got with Tim's ex?
Tony: Well they were, but then Harley's ex heard about it and she went out with Tim to stop it, so now they're even.
Ryan: Now that's what I call "pussy diplomacy"!
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