The Kentucky Plug

The act of inserting one big freakin thumb into their partners' vagina or rectum.

This could be a sexual act or used to help someone who's bleeding severely.
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The Kentucky Plug, aka The Kentucky Thumb, is in reference to the nearly fatal incident where a YouTuber named "Kentucky Ballistics" was shooting .50BMG "SLAP" (Saboted Light Armor Penetrator) rounds through a single shot Serbu RN-50 when what semmed to be an unusually hot round caused the gun to explode in Scotts' (KB) face.

Scotts' orbital bone was broken by the end cap, he had a broken nose, and a piece of shrapnel flew into his neck, slicing an artery. Scott then stuck his thumb inside his neck on a hasty drive to the Hospital. He survived, and is in good condition. Since then, other YouTubers in the same genre have made videos for Scotts Channel to help support Him in his recovery.

"My girl was on her period and she was out of tampons, so I gave her The Kentucky Plug as a temporary solution 'til we could figure something out.."