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Open Vagina Shut Mouth - related terms are OASM (open asshole shout mouth - for homosexuals) and GHSM (get hard shut mouth - for straight men). When people talk too much and put out too little, OVSM is the corrective term.
girl 1 - "My boyfriend just doesnt understand me, i told him how i felt about {x situation} and he just didnt understand my feelings! He never takes the time to really listen to me, he brought me flowers the other day but they were petunias and i just HATE petunias! We have been together for 3 years and i cant believe that..."

girl 2 - "OVSM!"
by sometimessusan October 01, 2010
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