Top definition
A group of girlfriends that share a pair of magical panties that brings luck getting laid to the person wearing them
Heidi: "I dont think we should accept any other girls in to the Ovarian Cysterhood, it will screw up the rotation schedule we have for sharing these special panties"

Heather:"I agree, the more girls in our Cysterhood the more period stains we see in them"
by Frankie Puscher November 20, 2012
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