The act of getting other guys to ejaculate on another's dick so that when he goes to impregnate his wife, it's up to chance who's baby it is.

More p's are added to the end of "Dip" deepening on how many people are participating
Example of a four-man Lucky Dip(p+)
Guy 1: "I gave my wife a lucky dipppp the other day"
Guy 2: "Was that the one I was in?"
Guy 1: "Yeah"
Guy 2: "God I hope it's not mine"
by WaffleTGR May 5, 2018
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