Top Definition
Originating from the popular breakfast platter, the Grand Slam, it is the act of a male wrapping his dick in bacon, biscuits, and sausage links, and using egg yolk as lube, then shoving it into someone's ass repeatedly while pouring syrup down their back and screaming "Breakfast is the most important meal of the day!"
Becky, I was going to make breakfast, but when I opened the fridge, I realized I had used all of the breakfast food to grand slam it up your ass last night.
by irishpunk84 July 09, 2010

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