by LeiaBee April 21, 2016

The act of using one's thumb or thumbs to infiltrate one's anal or vaginal opening using extreme force and excessive repetitions. Similar to finger blast.
by banditoslover05 July 5, 2011

The act of inserting an exploratory thumb into the anus of a girl whilst in the doggy position. If this is met with a positive reaction, or indeed no response, it can be taken as permission to change holes.
Friend 1: Did you shag her then?
Pioneer: Yeah, fucked her up the arse and everything. She was a right dirty slut.
Friend 1: Sound, how did you manage that?!
Pioneer: Well you know, just slipped in the pioneering thumb.
Friends 2 : Unbelievable tekkers.
Pioneer: Yeah, fucked her up the arse and everything. She was a right dirty slut.
Friend 1: Sound, how did you manage that?!
Pioneer: Well you know, just slipped in the pioneering thumb.
Friends 2 : Unbelievable tekkers.
by GenghisKorn October 4, 2010

THe exhausation of the use of ones thumb often leading to aggravation of the skin e.g blisters and often a great deal of pain. Hinders performance when competing and is a valid excuse for under performance. (see tennis elbow)
by Foxy March 2, 2004

The raised, angular position that the thumbs assume as they engage in texting, striking alternately left and right.
An added further feature may be the (scorpion) claw, an extended index finger that wraps around a Red Bull or other beverage while texting or otherwise interacting with a handheld electronic device.
An added further feature may be the (scorpion) claw, an extended index finger that wraps around a Red Bull or other beverage while texting or otherwise interacting with a handheld electronic device.
by twzjar November 21, 2012

by Just us 104 April 26, 2017

The Kentucky thumb is used to plug gaping holes in jugular veins of Kentucky people after a firearm detonation.
by Dorkydog May 20, 2021
