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?
by WBlitz September 23, 2013
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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.
by Mike Hooter March 24, 2006
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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.
by Mike Hooter March 07, 2006
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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.
by mackerel daddy November 28, 2009
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Something that is beyond normal amount of crazy; from the Cypress Hill song "Insane in the Brain"
Man 1: I'm getting my spine pierced later.
Man 2: That's insane in the membrane!
by thegestalt August 28, 2005
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A person that has no regard how cheap they look to another person and wear the name like a badge. a.k.a. Just being an asshole in general. Being a dildo skin.
The guy almost knocked me over in the coffee line so he could pick up a penny. What a dildation membrane.
by booger wall June 08, 2011
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Professor Membrane is an awesome scientist in the best show ever to come out of Nickelodeon, "Invader Zim". He is the father of Dib (Zim's arch-nemesis) and Gaz. Unfortunately since evil Nickelodeon cancelled the show we will never find out more about this eccentric randomly yelling scientist guy. Professor Membrane is also know for the creation of "Super toast" which sounds pretty awesome to me.
"Not now son, I'm making TOAST!" -Professor Membrane (exclaiming to Dib)
by invader_adie October 22, 2009
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