When you're hitting it from the back and you slip a thumb in.

Alternatively: then shrapnel from an exploding fire arm cuts your jugular artery, and you are forced you plug the wound with your thumb.
I was using those old SLAP rounds and the gun exploded! Had to use the ol' Kentucky Thumb
by Brandon's boy May 20, 2021
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Refers to Scott from Kentucky Ballistic's near fatal injury from a .50 BMG explosion that was averted when he put his thumb into a hole in his neck to stop the bleeding.
by BillNyeTheWesternSpy May 20, 2021
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verb.

The act of violently sticking your thumb into someone's bleeding anus.
"Brandon Herrera told everyone on YouTube that he loves the Kentucky Thumb. "
"After we used the dildo mounted a reciprocating saw last night, I had to give her the Kentucky Thumb"

"Just put a thumb in it... a Kentucky Thumb in it."
by Newton1391 May 21, 2021
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While having sex in the doggie position, a man will slap his partners ass and immediately shove his thumb in his partners ass
Yea man, last night was crazy in bed. We were going hot and heavy until i gave her the "Kentucky thumb"
by Gunther05071 May 20, 2021
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The kentycky thumb is when he puts it in the bum.
by AllyAx May 20, 2021
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Whilst getting dominanted by a faulty 50BMG SLAP round, the shooter who is either getting spanked by recoil and or bitch slapped by gun parts inserts an erect thumb into their jugular vein to control the intense secretion of bodily fluids.
After I tied my RN50 to my ballsack, which exlploded from a 161,000 psi blast, not 85,000 psi. My severed arteries and shredded balls required the maneuver known as the Kentucky Thumb.
by Infamous Griefer May 21, 2021
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