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1.
What medical students do during the semester. They give up their social lives for a few painful years so that they can attain their dreams of owning expensive sports cars and dating supermodels. It usually involves a lot of caffeine followed by furious studying then crying. Sometimes they will use their tears for lubrication during masturbation.
Barry and Baba used to be a fun guys during under-grad, but now they say the only way to pass is the insodus in their dorm rooms.
by BarryLutz September 25, 2006
 
2.
When everyone, instead of leaving a place, decides to stay for no good reason. The opposite of exodus.
The host thought everyone would leave after the keg was kicked, but instead there was an insodus at his house.
by Lucis September 22, 2006