When you shove your thumb in the anal cavity to prevent explosive diarrhea during intercourse
Last night, when I pull my dick out her ass, it started leaking. So I gave he a Kentucky Thumb.
by SQUIRRELMODE May 21, 2021
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Taking your thumb and putting it in your bf/gf's holes, take your pick

"I just gave my girlfriend the good ol Kentucky thumb"
"I just gave my girlfriend the good ol Kentucky thumb"
by ALLOFUS_ May 20, 2021
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The use of your thumb during sex with a virgin to prevent bleeding
Guy 1: ayo bro, I gave her the kentucky thumb

Guy 2: I heard about that from ak Jesus, that's sick bro
by Sp1cy_wat3r May 20, 2021
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Taken from a faulty SLAPP round the "Kentucky thumb" is when the man is about to conclude the sexual act and he jams his thumb up her arse.
"I panicked and just screamed KENFOLK and gave her the Kentucky thumb"
by Gerald4War May 21, 2021
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