shank

a shank is a homemade device resembling a knife. You can fashion a shank out of many things, most commonly: glass shards

to shank someone means to stab them with a shank. Derived from prisons as inmates would make shanks by sharpening spoons or using a piece of broken glass and wrapping half with duct tape for a handle.

"Did you see that guys shank? He keeps it tucked in his sock."

"He shanked that mo-fo good!"

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