An person, place, or thing, that is so repulsive and unattractive, that it results in an immediate and complete loss of a boner upon visual perception. In extreme cases it is impossible to get quality wood ever again in the victims future.
KayLeigh is an extreme Bonershrinker.
Dude, don't look at that damn Bonershrinker, or your space needle will become a space noodle.
An ugly/fugly female who looks so bad that if you look at her your boner will go away.
If you look up the word bonershrinker in the dictionary you will see a picture of Hilary Clinton