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A membrane in a thin, film-like structure that acts as a barrier against fluids. Membranes come in many different types -- mainly biological and synthetic.

Biological membranes are usually found inside of your body, covering organs, or anywhere else where moisture is necessary.

Some examples of where biological membranes can be found are on the inner walls of your cheeks (your mouth), a thin layer on the outside of your eyes, the glans of a human penis, the inside of a vagina, and covering the outside of a penis for several species of animals that have some form of sheath.
Doctor: I urge you to conciser circumcising your newborn son to prevent possible medical problems in the future.
Father: How does removing a layer of skin that's supposed to protect the membrane on his penis and preserve its sensitivity prevent future problems?
Father: It should be his own decision in the future to have it removed. What gives people the right to make life-changing decisions for someone that hasn't even spoken their first word yet?
Doctor: ... What happened to this being an example for membranes?
Membrane by WBlitz September 23, 2013
This occurs when sex is had with a woman shortly after her period has ceased. This woman usually has to have a high flow of menstruation for this to happen. The male has sex with the female and it is usually done with the woman on top of the man. Nothing is different from normal sex until the woman has her orgasm. As her vaginal fluid is being thrust out of her vagina, the left over menstruation fluid, the membrane, is also shot out of her vagina. Discovery of the membrane usually does not happen until the woman dismounts the man's penis, but the woman usually knows earlier. The woman's membrane is usually spread out over the man's pubic region. The man is most likely left in disgust. It is appropriate for the man's friends to call him Membrane Man once he shares the story.
Jacob told us the story of his girlfriend's membrane being spread over his pubic area after he had sex with her. We then called him Membrane Man for a great deal of time.
membrane by Mike Hooter April 19, 2006
This occurs when sex is had with a woman shortly after her period has ceased. This woman usually has to have a high flow of menstruation for this to happen. The male has sex with the female and it is usually done with the woman on top of the man. Nothing is different from normal sex until the woman has her orgasm. As her vaginal fluid is being thrust out of her vagina, the left over menstruation fluid, the membrane, is also shot out of her vagina. Discovery of the membrane usually does not happen until the woman dismounts the man's penis, but the woman usually knows earlier. The woman's membrane is usually spread out over the man's pubic region. The man is most likely left in disgust. It is appropriate for the man's friends to call him Membrane Man once he shares the story.
Jacob told us the story of his girlfriend's membrane being spread over his pubic area after he had sex with her. We then called him Membrane Man for a great deal of time.
membrane by Mike Hooter July 29, 2008

Membrane Picker 

Someone who tediously picks off all the white stuff off of oranges before eating them.
Shan would you just eat the fucking orange! stop being such a membrane picker.
Membrane Picker by Farrell Gilmour November 5, 2009

membrane keyboard 

A membrane keyboard is a horrible keyboard 8 year olds use because they think it’s good because it has rgb. It is not they suck they are the worst things to ever exist. If you have a membrane keyboard and like it I am going to assume you play fortnite and enjoy it.
I have a membrane keyboard! No one loves you.
membrane keyboard by C8 TM March 11, 2021

Membrane Game 

A sexual act involving the thumb in the vagina and pointer finger in the ass and rubbing the membrane between the 2
Wanna go play the membrane game?
Membrane Game by AndyK_79er July 2, 2011

Hussein in the Membrane 

A case of being so caught up in the hype of Obama that you've lost touch with reality.
Shontreeka is so into the Obama hype that she named her cats Hope and Change. She's got an acute case of Hussein in the Membrane.
More from Urban Dictionary
The number of years you are still sexually active
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.
sexspan by Dr Kat April 21, 2022
Word of the Day on October 28, 2026
A lighthearted reaction upon receiving disappointing news of some sort. Usually something that isn't a particularly a big deal, esp. when it primarily affects someone else - sort of a mild schadenfreude. Sometimes doubled or tripled, and possibly said in a sing-songy voice for added comedic effect to imitate a muted trumpet, which is how the meme originated.
You didn't get any napkins with your takeout pork fried rice? Womp womp.
womp by 175623226 November 3, 2011
Word of the Day on October 27, 2026
When your wife’s boyfriend let you sleep past 8pm 😎😎
Wife’s boyfriend: You have 5 more minutes
Me: Poggers!
Poggers by Just_Charles April 14, 2020
Word of the Day on October 26, 2026

Oblication 

A vacation, feeling more like an obligation, that involves visiting or staying with family.
So Joe where are you taking the kids for spring break vacation? We are going on an oblication to Boca to visit my mother-in-law.
Oblication by kimmerr May 5, 2011
Word of the Day on October 25, 2026
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