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1.
The effect you get when you squeeze a tomato sauce bottle and the sauce goes anywhere but at the food, usually sideways onto your shirt or pants. The effect can apply to any liquids including urine.
Example 1:

Person 1: "What happened to your shirt?"
Person 2: "Tomato Sauce Effect."
Person 1: "Oh right, yeah, I hate the Tomato Sauce Effect."

Example 2:

Person 1: "Hey man, why is there urine all around the toilet and on your pants?"
Person 2: "Sorry bro, I had a Tomato Sauce Effect."
by Fruit_Salad July 01, 2011