Book Thumb

Book thumb is from holding open a book with your thumb and index finger for long periods of time, causing pain in your thumb muscle.

I've got terrible book thumb from so much reading.

by blueberrypancak September 2, 2013

Thumb Bombing

To retroactively "like" or "thumb" a large amount of a persons facebook posts and/or pictures.

That new guy I met is such a facebook stalker. He's been thumb bombing my page for the last week.

by Oyeboman May 14, 2011

shark thumb

Shark Thumb.
The sexual act of placing you little finger (pinky) inside your partners anus (butt), while keeping all other fingers tucked in except the thumb that will stand proud and looks like a shark fin just slightly cresting the bottom of your partners posterior (butt) as they lay on their front.

During foreplay Sam Shark Thumb'ed meredith last night, meredith giggled as she looked over her shoulder and saw the shark fin (Sam's thumb).

by Samqwell December 30, 2019

Thumb Bumm

When you put your thumb in someone’s ass while walking by... Like a Wet Willy but with your thumb in their butthole.

Yo.. I just did a Thumb Bumm drive by to this rando girl at the bar.

by BEANERSCHNITZEL June 6, 2018

Thumb Plug

When a male can not reach climax so he inserts thumb into his own ass to get himself there.

"She couldn't get me to cum last night, so I Thumb Plugged myself."

by Brdmn68 May 2, 2018

Kentucky Thumb

A sex position in which a thumb is deeply inserted into a vagina.

My dick wasn't big enough, so I gave her a Kentucky Thumb.

by Balooga420 May 20, 2021

thumb on deck

the act of placing pressure of one's thumb on their partner's asshole.

"Last night Richard put his thumb on deck."

by learn.twerk February 12, 2020