slapping the bone

Whacking off furiously

Ew! This creep ass sent me a snapchat of himself slapping the bone!!!

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Slapping Bone

The act of one masturbating so vigorously that the skin tears off the handlers member and they are left stroking only bone.

Dude 1:'What's that noise'
Dude 2:'Oh, Will's just slapping bone...'
Dude 1:'Sounds grim'