The acceleration of typing speed but deceleration of the accuracy in the words , content and context while texting due to thumbs fatigue although thought flows are exponentially high. Also known as FBST syndrome.
I was texting this girl come over to my room but instead I got hit with Fast Brain Slow Thumb syndrome and wrote “Come Over my hoes” so I blew my chances.
by Sassy Sheesh November 24, 2021

by JimboSlice13 July 14, 2017

Sex position where you jam your thumb into your partner’s hole. Like you’re trying to stop blood loss.
“Dude I gave her the Kentucky Thumb last night and she went wild!”
“You shoved yourself thumb up her ass the hell did you think was gonna happen.”
“You shoved yourself thumb up her ass the hell did you think was gonna happen.”
by Knutter808 May 20, 2021

When you type so fast it looks like you have 4 thumbs
Like in anime/manga, they put multiple fingers to show the speed of the characters typing (with an addition of movement symbols like "《" "//" "=" ect...)
Like in anime/manga, they put multiple fingers to show the speed of the characters typing (with an addition of movement symbols like "《" "//" "=" ect...)
by Ramen is gr8 June 7, 2019

In the modern classroom, passed notes have been replaced by students thumb typing messages to one another.
by Grammerican September 16, 2013

Damn it's bleeding bad give it the Kentucky thumb or Damn she's bleeding bad give her the Kentucky thumb.
by anonymous May 20, 2021

by itichie_nocanpo October 22, 2006
