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when you're so deep in someones ass you no longer have opposable thumbs
bro was so thumb-ass'd he couldnt peel a banana.
thumb-ass by cumslider February 1, 2024

sitting around with your thumb up your ass 

What have you been doing all day? Sitting around with your thumb up your ass?

Thumb up your ass

(adj.) Not doing what you should be doing, be it at work or in free time. Pls note it can be 'thumb up my/your/his/hers/possessive pronoun's ass" as needed. I just put "your" in the entry title because it's the most common.
Manager bitching at employee at anywhere Wal Mart USA: Yo! Cletus! Stop sitting around with your thumb up your ass and get unpacking those crates.

Get Your Thumb Out of Your Ass 

...And help, you lazy fuck!

Getting your thumb out of your ass means to stop wasting time doing nothing when you've got shit to do.
"Ugh, I hate English. It's so boring!"
"Yeah, well this is a Group Project, so you're not the only one one whose neck is on the line. So get your thumb out of your ass and help, you lazy fuck!"

Thumb-up-the-ass 

A word to describe an egotistical or unnecessarily dismissive comment or opinion online
Online person: (has an egotistical or unnecessarily dismissive opinion)

Online person 2: Jesus Christ on a cracker, please stop it with your fucking thumb-up-the-ass opinion
Thumb-up-the-ass by Dr. Ough June 21, 2024

ass-thumbing

Ass-thumbing is when you go to the bar and drink Captain and ginger, and then you strategically place your yourself between 2 people and nonchalantly stick your thumb in someone's butt. The goal is not to get caught and to make the person getting ass-thumbed think it was someone else. Ass-thumbing also goes by " doing the Crosby" Ass- thumbing is believed to be a German tradition, and in the States, there is an ass-thumbing group in the mid coast Maine area.
Hey, let's go out to the Myrtle and do some ass-thumbing.