Another term for a woman's smelly clam or vagina.
Chandler didn't want to go down on Shawna because her oister grossed him out.
by therealrickyspanish February 12, 2016
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when you skeet on in your hand and slap a ho with it
"man i didnt want to shoot it in her eye, so i gave her a dirty oister"
by Oooo pap mahalo October 15, 2005
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