Inserting your thumb inside someone's ass, vagina or jugular vein. Usually it is done by men or women with large round thumbs that have thin dull fingernail, it is also used if your jugular is severed or slightly punctured.
Scott gave her the Kentucky Plug last night
A sex position where you shove your thumb into you partner's neck while you pound away downstairs.
Oh baby, you're totally getting the Kentucky plug tonight!
Sex position involving sticking your thumb inside your partner's (preferably the bottom's) asshole
T: How about we do the good 'ol Kentucky Plug position?
B: Oh, you know I'm up for it!
When you need to, for whatever reason, plug a human orifice with your thumb. Sometimes you need to Kentucky plug the hole in your neck that is rapidly leaking blood. Other times, you need to Kentucky plug your girlfriend's asshole because it's Tuesday and you haven't plugged it since Sunday and she's itchin' for a pluggin'.
Mr. Herrera: Scott gave me the Ol' Kentucky Plug last night!
His friend: dude... gay....
Mr. Herrera: No, this time he was just plugging a shrapnel wound in my leg...
His friend: What do you mean "this time"... Did he Kentucky Plug you some other time?
Mr. Herrera: *abruptly changes subject*
When you receive oral sex while on the way to the hospital and you shove it too far down their throat.
Was giving my girlfriend the Kentucky Plug last night and she almost didnt make it to the hospital.
putting the fingie in the poopy hole when it bleed
derived from the infamous kentucky balistics incident when he put his thumb in his ass or something idk
when you tell her she's getting the kentucky plug tonight