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1. to penetrate another with a dildo strapped to ones forehead, like a crazed unicorn.

2. to battle a rival lesbian to near death by clashing forehead dildos in a stag-like manner.
1. The whiplash injury was a result of drunken screwnicorning.
2. The angry girls were screwnicorning over the hot chick.
by CeltGal April 03, 2007
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