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1. nerfel
The sexual act in which a man penetrates a woman's (or man's) navel, also known as the belly button, with his phallus.
1. Guy 1: Dude, I totally nerfelled that chick last night!
Guy 2: Sweet...

2. Betty didn't want to have sex with Tom, so instead she suggested that they nerfel.

3. James walked in on his dad nerfelling his mom last night.
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