a unit of one hour's work by one person's thumbs or fingers, especially within the context of interacting with a smartphone touch screen
The number of thumb-hours spent on cell phones and tablet computers has skyrocketed in the last few years.
by S. Sheldon April 26, 2011

Accidentally bumping the unneccesarily accessible thumbs up/"like" button while using Facebook messenger.
Friend: my dog just got hit by a car.
You: (Thumbs up!)
Friend: .... :|
You: aghhhhh sorry, unintentional thumb
Friend: that thing is unneccesarily accessible.
You: (Thumbs up!)
Friend: .... :|
You: aghhhhh sorry, unintentional thumb
Friend: that thing is unneccesarily accessible.
by LoFrankly March 28, 2015

Thumb licker: (noun) a person who puts both of their thumbs in their own mouth then shoves them up their partners,friends, peers, ect. asshole then licks their thumbs again.
by Thumblicker23 November 12, 2017

While having Doggystyle sex with your significant other you place your thumb in her asshole. There for placing "The Thumb in the Plum."
Jill was riding my ass all day about the chores I hadn't gotten to yet, so when we had sex later that night I put "The thumb in the plum."
by Broadway Harmier December 24, 2021

by learn.twerk February 12, 2020

When youtubers use a picture of boobs as their thumbnail to attract perverted viewers to their videos and increase the number of views they get
by phillipm August 23, 2014
