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An accident that occurs during some type of sex act. For example, skinning one's knee on a car door while having mad passionate car sex.
"I can't believe I had another sexident!"
sexident by Shanda Lear March 21, 2004

sexvidence 

The evidence left after having sex. Any evidences that sexual activity took place.
I came home and immediately washed my underwear and took a shower in order to destroy any potential sexvidence my wife might find.
sexvidence by Marak October 2, 2016
An unplanned sexual encounter with your ex.
Dan just came over to get the rest of his stuff and before I knew what was going on a sexident had occurred.
When you have sex that you didnt plan on having (like having sex while you're drunk)
*person one calls person two*
person 1: hey sorry i was a bit drunk last night
person 2: oh thats okay. it was just a sexident.
sexident by Natalie and Andria January 19, 2006

Selfidence 

When you're a bit to lazy/high to say "Self Confidence" and you say "Selfidence."
Joey - "Man, I feel like I don't matter anymore."

Ana - "You just need some more Selfidence!"
Selfidence by BlueJay Gin March 10, 2018
An accident that happens that happens during sex that is gross or leads to an injury
I had a sexident, we fell of of the bed and she landed on my wrist and it broke
Sexident by Heyitsj000 March 22, 2019