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1.
The attempt during a debate to use a comparison between two weakly related items to make a point that any intelligent individual would immediately dismiss as laughable.
Jon used the broccoli argument to counter critics of abortion by saying: "Just to be on the safe side, don't masturbate anymore, you'll be committing genocide when you throw the tissue away"

Justice Antonin Scalia originated the broccoli argument while debating the Affordable Healthcare for America act: "Could you define the market — everybody has to buy food sooner or later, so you define the market as food, therefore, everybody is in the market; therefore, you can make people buy broccoli" -
by MadScribe April 07, 2012