thumbching 

The act of punching someone in the butt with thumb between the fingers of the clenched fist, penetrating the butt hole with the thumb.

Ooooooh you just gave me a right proper thumbching

thumbching by Dice life October 11, 2015

Cross-Thumbing 

Cross-Thumbing is a technique developed by Dr. Mark Ringwald PhD. and Dr. Nick Pollack PhD. at their video gaming ergonomic laboratories at Brandeis University. The technique is mostly applied when playing the Nazi Zombie segment of "Call of Duty: World at War". The technique consists of controlling the right thumb stick of an XBox 360 controller with one's left thumb while the right thumb is occupied with pressing one of the four buttons above the right thumb stick. The crossing over of the left thumb across the center of the controller, and in said gaming application is most useful while rebuilding barriers in the zombie level's windows to slow down the flow of zombies in the house. The technique allows the player to repair said barrier as well as aim and dispatch targets within the level.

Holly shit Doo, did you see that fucking sick cross-Thumbing stabbing action on that mother fucker? I cut his fucking dome off, NOOCH!!!!!

Cross-Thumbing by Cactus Jack O'Malley March 5, 2009

thumbering 

Using your thumb for screen control for handheld device

The iPhone 6plus is not thumbering user friendly.

thumbering by Men of PH February 19, 2015

Thumbing Your Nuts 

Wasting time doing absolutely nothing. Usually in a work setting.

Dave: Have you accomplished anything today?

Paul: Hmmm, well, I did make some copies.

Dave: You've just been standing around thumbing your nuts, haven't you?

Thumbing Your Nuts by SteelerB56 February 28, 2011

thumbing in a softie

The term given to pushing a flaccid penis into the vagina.

Drunk dude: Im too pissed, its never gonna work
Female: Cmon work with it otherwise ill fuck your friends
Drunk dude: Well alright ill try thumbing in a softie.

thumbing in a softie by Jared Ellis January 18, 2008

Thumbling 

Engrossed in your phone or device while being oblivious to the world

It's the worst when you're walking down a crowded sidewalk and you get stuck behind someone walking slowly because they're thumbling.

Thumbling by Munirih19 September 15, 2014

green thumbing 

Someone who cheats while playing "Guitar Hero" by placing a rubber band around the green button, limiting the number of buttons one needs to press, in order to obtain a higher score on the Hard or Expert difficulties.

"Dude! Did you hear that John got 100% on "Through The Fire and Flames???"

"Whatever. I heard he was green thumbing. I'd have to see it to believe it."

green thumbing by Gustafae March 9, 2008