An STD that causes men to jizz caterpillar eggs. The eggs later hatch and the butterflies fly out of the vagina.
"Hey Samantha, why are you going to the doctor?"

"I think Brad gave me the butterfly effect, I've got butterflies in my stomach!"
by The soggy tomato February 19, 2018
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1. A theory that everything affects everything-means that everything you do is kinda importsnt and has a reason ; Even the smallest things that you do can really affect your life-it also claims that if you could go back to past and change things that you might think are not important, things today would change (like so much) ; It is a part of The Chaos Theory “This effect grants the power to cause a hurricane in China to a butterfly flapping its wings in New Mexico. It may take a very long time, but the connection is real. If the butterfly had not flapped its wings at just the right point in space/time, the hurricane would not have happened. “

2.An Ashton Kutcher movie from 2004.

3. A song by Travis Scott from 2017.
1. « Wow, i wonder what would have happened if i kissed Maria at that school dance »
« Dude, what are you talking about, don’t mess with that butterfly effect thing »
by therealnefertiti November 14, 2017
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The scientific theory that a single occurence, no matter how small, can change the course of the universe forever.
1. A man travelled back in time to prehistoric ages and stepped on a butterfly, and the universe was entirely different when he got back.

2. The flap of a butterfly's wings changed the air around it so much that a tornado broke out two continents away.
by Jonah Rowley November 7, 2004
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