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.