Thumbs up means they are in love with you
Did you see Stephanie do thumbs up to me?
I think she loves me
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.
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."
The lack of exercise caused by being on a portable game device or smart phone for extended periods of time. Typically Apple or Blackberry users
You're looking a bit weighty. Have you been doing any exercise?
...Only thumb exercises
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
boobs on thumb