Top Definition
The act of putting your right hand palm up, flicking the middle finger back and forward whilst saying "BONG!" to vulgarly arouse a young girl or boy.

Can also used to intimidate a friend or PE teacher by "bong fingering" their rectum or testicles.
Gaz : "How can I arouse the potential Ryan?"
Ryan : "Use the Bong Finger!"
Potential : Oooooohhhhhh.... *orgasms*
by Kitchhh May 17, 2010

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