When you are so intensely afraid of another individual that you reach a point of sexual arousal. Physiological symptoms include: erect nipples (also known as: fear nipples) and increased blood flow to the genitals, resulting in moist panties.

The female version of the 'fear boner'.
Did you see Kristin's fear nipples at the Haunted House? She must have really been scared.
by KWellsJBecks September 19, 2012
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