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The Butterfly 

A "trick" in which a man staples his scrotum to his leg to make it look like a "butterfly," made famous when Steve-O did it in a night club in Los Angeles.
Guy 1-"Dude, I'll give you 5 bucks to do the butterfly!"

Guy 2-"Who do you think I am, Steve-O?"
The Butterfly by GrimGreeper August 21, 2008

The Butterfly 

This is a sex position. The recessive has their legs open, while the dominant strokes and flaps his hands in a butterfly motion to give the strokes more power.
Ikah: Hey bruh, did you get it in?
Gomez: Yeah bruh, I did the butterfly on her
Ikah: What did she say after?
Gomez: Nothing, it was too strong and she died
Ikah: I guess you murdered that pussy... literally

The butterfly 

When a sexual partner goes down on a girl and Raspberry the vagina causing their pussy flaps to flutter
The butterfly by PoshJosh69 August 23, 2023

The Butterfly Project 

1. When you feel like you want to cut, take a marker, pen, or sharpies and draw a butterfly on your arm or hand.

2. Name the butterfly after a loved one, or someone that really wants you to get better.

3. You must let the butterfly fade naturally. NO scrubbing it off.

4. If you cut before the butterfly is gone, you’ve killed it. If you dont cut, it lives.

5. If you have more than one butterfly, cutting kills all of them.

6. Another person may draw them on you. These butterflies are extra special. Take good care of them.

7. Even if you don’t cut, feel free to draw a butterfly anyways, to show your support. If you do this, name it after someone you know that cuts or is suffering right now, and tell them. It could help.
Have you heard of The Butterfly Project? I heard it helped (Friend) stop cutting. Maybe I should try it.

The Butterfly Effect

A part of the chaos theory that states that one small change in a situation(expieramental noise) can drastically change the outcome of an event. Butterfly comes from the example of the flap of a butterfly's wing altering the atmosphere around it causing(or preventing) a major event somewhere else.

Also a movie with that Ashton Cootchie
Example 1: The Butterfly effect is a cool mathematical theory.

Example 2: The Butterfly effect was supposedly based on Chaos Theroy although there is no correlation whatsoever.
The Butterfly Effect by Ryan July 26, 2004

The Butterfly Effect

A small gesture or action in the present that can generate significant results in the future.
My client just referred their friend to me to help them find a home.

Sounds like The Butterfly Effect is in full motion!
More from Urban Dictionary
The phenomenon where adults salivate at children's toys
Every time I walk into the toy aisle, I catch myself kidulting over the latest action figures and LEGO sets!
kidulting by Emotional Cruiser October 12, 2025
Word of the Day on October 4, 2026
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026

Pee Calculus

When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Pee Calculus by anorlondo October 1, 2026
Word of the Day on October 2, 2026
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