The kentucky plug is when you stickyour dick into a pussy for an extended period of time.
Person #1 -"How long has those two been in there"
Person #2 -"Probably doing the Kentucky plug, after that it will smell like dead fish carcases, a public pool and in some cases blood."
When you and your lady or gentlemen friend are getting intimate, and you stick your thumb into them, in assumably a nicer way than a man with a serrated vein would stick their thumb in themselves to prevent blood loss.
A form vaginal or anal play, using ones thumb to "plug up the whole." This term is inspired by the popularYouTube channel Kentucky Ballistics. After suffering a nearly fatal .50 caliber related accident, the YouTuber stuck his thumb into the hole in his throat. So the term "Kentucky Plug" means to stick your thumb up your partner's hole, and plug it almost as well as Kentucky Ballistics plugged his throat.
A sex position where you shove your thumb up a girl's vaginal cavity and act like your trying to plug up blood from coming out. (even better if they're on their period)
When you stick your thumb up your partners rectum after they have the Jose special at the local Hispanic restaurant and the back pressure of their fart builds up and causing your finger to break in a backwards motion when it explodes.
did you hear about what happened to Scott, get gave Brandon the oleKentucky plug and now he's in the ER.
When you get creative in plugging a hole and end up using your thumb. This originated with a neck wound, but I think we all know how the Kentucky Plug will most often be used. In the dark on a saturday night with a girl you barely met at the bar.
"Yeah, she said she needed more so I gave her the ol' Kentucky plug." "You just put a thumb in it?" "Yep. I just put a thumb in it."