The sexual act of engaging in anal sex while eating food off of the receiver's back.
The grapes tasted so much better eaten off of Jessie's back during the Forbidden Picnic last night.
by Optimus Prime 2.0 September 7, 2011
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A sex act involving 2 or more people where picnic style foods (apples, crackers, sandwiches, cheese, dip, etc.) are shoved into one participant's anus thus making him/her the "picnic basket". Everyone then proceeds to have sex, orgy style on top of a red-and-white checkerboard patterned blanket that has been laid under a tree on a grassy hill. After the group orgasm each person takes some food out of the aforementioned picnic basket to munch on.

*Note: 2 or more people need to be in attendance, sticking food up your ass and masturbating does not count.
"Jill and I were planning our own little Forbidden Picnic but on the way we met a homeless man which made our Picnic all the better."
by PicnicFan6969 February 16, 2012
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Conan O'Brien's favorite sexual position, presumably involving a picnic table and a basket of delectable delights.
We were out on a sunny park date, when Jennifer asked me to perform The Forbidden Picnic.
I had no idea what to do, but I rummaged in her picnic basket and violated her with it's random contents.
by Gnawrly September 7, 2011
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a sexual act pioneered by Conan O'Brien and Andy Richter in which two men hold a third partner betwixt the two, suspended from their erect penises, and begin to cartwheel simultaneously in the same direction.
Hey man, did you see that picture of Conan O'Brien and Andy Richter giving Max Weinberg The Forbidden Picnic?
by sconniestyle September 7, 2011
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