a unit of one hour's work by one person's thumbs or fingers, especially within the context of interacting with a smartphone touch screen
The number of thumb-hours spent on cell phones and tablet computers has skyrocketed in the last few years.
Thumb licker: (noun) a person who puts both of their thumbs in their own mouth then shoves them up their partners,friends, peers, ect. asshole then licks their thumbs again.
Tyler is on that freak shit he's a Thumb licker.
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.