When you reach around to jerk yourself off and you accidentally give your asshole the thumbs up
The act of taking ones thumb, rubbing it between the ball sack or vagina and asshole. Then rubbing said thumb onto upper lip, leaving a residue to be smelt for an extended period of time.
Dennis: Dude! Why did you just put your hand in your pants and rub your lip?
Mac: I gave myself a thumb sleeve, I needed to know what I’m dealing with down there
When one is bored and lonely so one masturbates with a thumb wedged knuckle-deep into one's own anus.
I told them I fell asleep early because I didn't want them to know I spent all night Thumb-Bummin.
Thumb face or Thumbface is when a person takes a selfie with their chin tucked in, creating a double chin. Often the person has "crazy eyes" as well.
Did you see that photo of Matt? He had an epic thumb face.
Someone who presses the buttons entirely too hard on any game controller. Similar to someone with a lead foot in a car.
Dude, you could hit the buttons faster if you didn't have a lead thumb.
When you insert your thumb into your partner’s rectum, and proceed to spit on them simultaneously.
“Bro I totally gave this bitch the sickest thumb llama last night”
To wrap your thumbs around dat fat ass from both sides as to spread the butt cheeks before smashing
DAYUUUUMMM!!! Would love nothing more than to thumb wrap dat fat ass right now!