When your Serbu 50 cal explodes in your hands lacerating your jugular and a family member or significant other plugs the hole with their thumb saving your life.
Not to be confused with the Kentucky thumb the Kentucky plug is a sexual act where one person smokes Kentucky Plug tobacco while their partner penetrates from behind.
This position can only be done when your girl is on her period. When you're making out with your girl and you shove your thumb into her hole to stop the bleeding like Kentucky Ballistics did to his jugular .
A sex position in which the male sticks his "Kentucky thumb" in the females buttox in reference to popular youtuber Kentucky Ballistics incident in which he had to "put a thumb in it"when he shoved his thumb into his neck as to stop the bleeding from the incident involving a hot .50 bmg slap round.