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While popularly used as the term for approval (thumb's down for disapproval ) Not many know that in rap or in Fighting word's thumb's up means safety off due to the motion of taking the safety off is putting your thumb's up.
Man, I jumped out the car and went thumb's up real quick. Bout to be blood in these street's.
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.
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).
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.
the act of placing pressure of one's thumb on their partner's asshole.
"Last night Richard put his thumb on deck."
When you stick your thumb in a girls butt during sex. You've gotta love it like it's your last.
Person 1: Yooo how was your night?? Did that girl sleep over?
Person 2: Ya lmao I thumb butted I think I love her.
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.