Noun: A sex act. One partner uses their non dominant thumb by inserting their thumb into the anus of the other partner while giving oral sex.
The dominant partner performs a Kentucky Thumb applies pressure to the anal interior with the thumb and places the remaining 4 fingers one of the posterior cheeks, gripping it like a Basketball. All while preforming oral sex on the recipient. This position can be done in either the 69 position or in the standing position.
by TheDuke44Mag May 20, 2021

When you have An abnormally large thumb and stick in in a transgender robots vaginal area. Once done cut off your plastic finger, dip it in some frosting and shove it up your ass
by Land cooch September 20, 2018

by fxper March 19, 2021

by brogotblackandwhite April 9, 2022

"yeah man she was on her period, i gave her the Kentucky Thumb on accident"
"His gun blew up, that Kentucky Thumb saved him"
"His gun blew up, that Kentucky Thumb saved him"
by NoticeMeBrandon May 20, 2021

A mid to late 30s white male with a receding hairline, and to top it off a head shaped like a thumb.
by Ladyford September 23, 2017

by keeen7 May 19, 2022
