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.
by Gerald4War May 20, 2021

by Durban Bictionary May 20, 2021

Brandon: Bro I Gave Scott the Kentucky Thumb Last night
Donut: Dude that's so hot, you should do me next
Donut: Dude that's so hot, you should do me next
by quinnthespin May 21, 2021

by BiggdadDphatsak May 20, 2021

by Not Guitarist Ryan May 20, 2021

The process of sticking your thumb in a wound from shooting a 50 Caliber SLAP round and it horribly wrong or sticking your fattest thumb in someone for sexual pleasure.
by DSarge May 20, 2021

Guy 1: ayo bro, I gave her the kentucky thumb
Guy 2: I heard about that from ak Jesus, that's sick bro
Guy 2: I heard about that from ak Jesus, that's sick bro
by Sp1cy_wat3r May 20, 2021
