What is The Knuckler?
1.
Taking your fists pressing them together where both tips of your knuckles are pointing out and creates a V shape. Another person does the same and you press your knuckles together making a Diamond and insert the penis and proceed to have sex with it
My girlfriend Tina and I were experimenting and did The Knuckler.
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An advanced skateboarding flip trick which is basically a hardflip being rotated 360 degrees. A normal hardflip is a Frontside Pop Shuvi..