1. (noun) a lesbian with a dildo strapped to her forehead
2. (verb) to penetrate another with a dildo strapped to ones forehead, like a crazed unicorn.
3. (verb) to battle a rival lesbian to near death by clashing forehead dildos in a stag-like manner.
1. The screwnicorn winced as her dildohit the doorframe.
2. The whiplash injury was a result of a drunken screwnicorn.
3. The angry girls had a screwnicorn over the hot chick.
When a dyke puts a strap-on on her forehead and then proceeds to place the dildo in another persons orifice.
Large Marge wanted to try something new with her lesbian lover, Roxy, so she slapped that bad boy to her forehead and then went at her stinky meat wallet like a jackhammer going at cement.