This effect happens when professional golfers wake up in the morning and read the newspaper and find out that Tiger Woods is playing in the next tournament. After they hear this they all get worried and shit themselves.
Bob: "When I got onto the golf course today and saw Tiger the Tiger Woods effect hit me. Did hit you too?"

John: "Of course it did it is Tiger Woods."
by stevo supremo August 18, 2011
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In parallel thinking to the butterfly effect, this is not knowing what will happen when trying something new for the very first time. Like taking a piss with morning wood, you can never predict where or what direction your piss will go.
Like when NASA first had astronauts in space, they had no idea if they would come back alive until they did it.
Those scientists could only rely on the morning wood effect to be in their favor.
by Devil's Workshop Industries April 17, 2014
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