When you're nailing your sister from behind and you slip in the back "accidentally" so you shove your thumb in her asshole so blood doesn't get on your bed.
Had an accidental intrusion with sis last night and had to give her the Kentucky thumb to keep the sheets clean
by Imprezaraptor May 20, 2021

An expression of awkwardness. When you find yourself suddenly alone, bored and with nothing to do. Can also be used to convey a feeling of abandonment.
“Where the hell have you guys been? I’ve been sitting here all night thumbing my nuts waiting for you!”
“Well I’m not gonna just sit here thumbing my nuts!”
“Well I’m not gonna just sit here thumbing my nuts!”
by Joezer4911 June 17, 2022

To like posts, pics, shares,...etc in an excessive manner. A person who spends way too much time on Facebook liking everything, to the point of ridiculousness.
by demoniablo July 30, 2015

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

When Tiffany raised her arms at the concert you could see the dimples on her lower back. Alec said "That's a nice set of thumb racks"
by JPetto19 November 30, 2023

by therealconnorgriffith December 24, 2016

The Three Thumb Popsicle is a sexual act in which three men fuck a woman in the ass three dicks at once, then they extract the doodoo butter from the anus and lick eachother's thumbs.
by First Lieutenant Dunn October 21, 2017
