The act of using your thumb to plug any orifice, while you SLAP the shit out of your partner. Inspired by a horrific shooting accident with ridiculously hot .50BMG Rounds.
Had to give 'em the Kentucky Plug, shove my thumb in 'er throat while I slapped her ass red.
A exciteing sexual move! When he/or she thrusts his/or her thumb into his/or her partners anus with the force of a 50 cal "Slap" round. 9/10 times this move will result in blindness for both partys.
"Jeffs wife had been walking into everything. She lost her site after he gave her the Kentucky plug last night"
"So we were going hard and I exploded all over his face, then he stuck his thumb in his gaping hole"
"Dude, sounds like he gave himself a Kentucky Plug"