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The part of an item of food you and a friend purposefully don't eat when sharing said food item, as to not accidentally ingest some of the other other's saliva. Thus preventing the spread of germs.
Mark: "Dude can i share that piece of pizza with you? I'm starving.... "

John: "Sure... I guess, we just have to be sure to leave a saliva buffer zone..."
by BlueRayz August 05, 2010
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