The act of placing one's chin on the top of another person's head and working the jaw in a rhythmic, snapping motion to cause a painful, repeated, clunk on the target's cranium. Often performed between rival siblings.
My stupid sister caught me masturbating in my Mom's thong again so I put her in a full nelson and gave her some serious head peter. That'll teach her.
Intercourse performed while swimming or otherwise immersed in water.
Dude, Kayla and I were skinny dipping at her sister's friend's cottage - one thing led to another and BOOM! Watercourse.
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