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The transfer of something from an area with a high concentration of said thing to an area with a low concetration through a permeable membrane. A study method popular with many pupils and students, usually achieved by falling asleep with ones head directly atop of ones study materials.
Student #1: Dude, I'm soooo tired and stressed about tomorrow's test, I'm soooo unprepared.

Student #2: Dude, relax. You can kill 2 birds with 1 stone, just use osmosis.
Osmosis by theboi December 25, 2009
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osmosis besties 

The process of befriending the best friend(s) of your best friend. Given the mutual common best friend, a relationship can easily be formed with your best friend's said best friend(s).
My best friend's friends came to visit this weekend. I instantly became best friends with them through the process of Osmosis Besties. We are now one group of real life Besties.
osmosis besties by KyFace September 28, 2009
acquiring knowledge without actually seeking it
It was through osmosis that I learned about this blatantly undesirable video game.
The net diffusion of water molecules across a semi-permeable plasma membrane
Imagine a tea bag, the bags walls are porous (holes in them) just like a membrane.

The water displaces inside the bag, now although this has a lot to do with environmental pressure (ie. the water) it is mostly to do with diffusion, Osmosis is a form of diffusion*, specifically across a semi - permeable (porous) membrane.

*

Diffusion is displacement of molecules so that they are equal.

E.g. Imagine your friend sprays deodorant/perfume on the far side of the room, it takes a couple of seconds to reach you.
It is a highly concentrated cloud at first but then spreads (diffuses) into the air until there are an EQUAL concentration of spray to the air.

E.g. five 1 pennies to every three 2 pennies
Osmosis by Mantrastic March 1, 2010

Oshawa by Osmosis 

Inability to fight the urge to wear white Baby Phat pants and extra large hoop earings.Usually occuring within 3-5 days of residing in Oshawa.
"Hey Jes, I need to get back to the city hella bad, I'm feeling a little Oshawa by osmosis."

osmosis brown 

Osmosis brown stop shitting on the floor
osmosis brown by Tater Hoss January 13, 2017

internet osmosis 

the passive process by which one learns of something via a. social networks or b. other forms of internet-based informational services. It is key to note that the knowledge in question must be about something one does not have first-hand exposure to and/or experience with.

Used most specifically in reference to second-hand knowledge of internet-based phenomena/culture such as a meme.

Etymology: An adaptation of osmosis as defined as a study method.
"The cake is a lie?" Yeah, I know what that references - I've never played Portal but I learned about that meme through internet osmosis.