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The act of eating KFC mashed potatoes and gravy off of someone in a sexual manner.
This nasty girl in my high school was "bragging" about how the way-older dude she was dating worked at KFC and would bring home buckets of mashed potatoes and gravy to eat off of her. I think she thought everyone was going to be titillated by her Tijuana Picnic but it just made everyone sick.
by DeeJayPee January 09, 2009
An orgy in which two or more members are given a Tijuana Doughnut.
I heard last night that Timmy went to a Tijuana picnic!
by grumblekeix February 05, 2009